Dt12 transmission problems

By following the steps in this video, you'll be able to maximize your performance, safety and fuel efficiency with the Detroit DT12 Automated Manual Transmis...

Dt12 transmission problems. Designed for Your Bottom Line. UltraShift PLUS transmissions are designed for optimal fuel efficiency, and less wear and tear on drivetrain components for reduced maintenance costs. Compared to a torque converter automatic, an UltraShift PLUS will cost you about 50% less. It will also double the length of lubricant change intervals and use 50% ...

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4 06-14-2021, 11:03 AM. (06-13-2021, 05:42 PM)SWM_dieselman Wrote: GM all, I have 2014 freightliner cascadia (DD15) in my shop for a no "crank". It only crank if you jump the starter. I have change starters, ck clutch via DDL 8.13, check all relays and fuse. When turning the key it clicks at the SAM chassis module only.DDC-SVC-MAN-0084 DT12 Transmissio n SPN 520970 FMI 7 Updates include measuring of clutch. DDC-SVC-MAN-0140 8 02-15 All information subject to change without notice. 3 ... Is the transmission air supply pressure greater than 689 kPa (100 psi)? a. Yes; Go to step 6. b. No; Go to step 4. 4. Shut the engine OFF.The transmission problems that were most common on the 2013 Pathfinder models were jerking and shaking during acceleration between 15 mph and 30 mph. These were followed by a non-engaging transmission, shifter stuck in Park, transmission slippage, and the transmission slips out of Park. The most common solution to the problem was the CVT ...Training video for some of the new Freightliner Cascadia Evolution Automatic Transmission trucks at HO Wolding.Detroit™ DT12™ Transmission has 12 forward gears and two standard reverse gears that can be shifted automatically or manually. Shifting and clutch actuation are computer controlled and there is no clutch pedal needed to operate the vehicle. Automatic shifts are selected for fuel economy or engine power. The DT12 will notWARNING!!: ⚠️⚠️⚠️Always use the proper tools and safety equipment to perform this job. Failure to perform the job correctly can result in personal injury or ...

ACDelco GM Original Equipment DEXRON-VI Full Synthetic Automatic Transmission Fluids are designed, engineered, and tested to rigorous standards, and are backed by General Motors. They offer a full synthetic blend with premium quality and high performance. They help provide more consistent shift performance, even in extreme conditions, and ...Shell Spirax oils are designed to help keep your transmission components protected so that they can go on working efficiently. For example, Shell Spirax S6 AXME and Shell Spirax S6 GXME have special frictional properties and high fluidity that reduce power loss, lower the operating temperature and offer higher mechanical efficiency.The 49X’s combination of the Gen 5 Detroit DD15 engine and the vocational-spec Detroit DT12-V automated manual transmission handled many long and aggressive grades with ease, and with a belly ...If the desired gear and the actual gear do not match, then the PCM will set a diagnostic trouble code (DTC) and illuminate the Check Engine Light. Should either or both of these speed sensors fail, you may notice one or more of the following 3 issues: 1. Harsh or Improper Shifting. Without a valid speed signal from these sensors, the PCM will ...Dt12 Transmission Problem Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by LakenT, Mar 19, 2023. Mar 19, 2023 #1. LakenT Bobtail Member. 21 3. Jun 19, 2022 0. We have a 2017 freightliner Cascadia with a dt12 trans. I have noticed when I drove it, it does not wanna shift into to gears easily.Allison has traditionally offered a few options for transmission fluid, including TES 295, TES 468 and TES 389. There are performance and cost differences to consider with these fluids. "TES 389 ...

FIELD SERVICE CAMPAIGN BULLETIN - National Highway Traffic Safety ...Concerning Detroit Diesel, please note that trying to pair a transmission other than a DT12 with the Integrated Detroit Power engines (DD13 400 and DD15 400) WILL CRASH THE GAME. I have yet to find a way to make the engine switch automatically if you try to put a transmission you are not supposed to on that engine, as such be warned. (I did try ...Couple of things Mack and Volvo share Engines and transmissions. So Mdrive is the same as Ishift transmission. Mp8 is a D13. Volvo has a 750k transmission warranty on the Ishift. I am not sure of Mdrive has the same warranty. Replacing the complete MDrive is pricey but at the mileage you are at it should be covered under warranty.WARNING!!: ⚠️⚠️⚠️Always use the proper tools and safety equipment to perform this job. Failure to perform the job correctly can result in personal injury or ...The new DT12-HE automated manual transmission is purpose-built for extreme efficiency, performance and reliability. For customers looking to reduce fuel consumption as much as possible, the DT12-HE boasts cutting edge technology to take efficiency to the next level. FEATURES DT12 ™ ON-HIGHWAY SERIES *Available in 2021

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ULT's powertrain program is second to none. Each technician starts and finishes their transmission or differential by paying attention to every detail. All new original OE synchronizers, air valves, bearings or NTN/Bower bearings are installed in every unit. All hard parts used are of OEM or better quality. We invite our customers and dare ...Rotation is picked up by gears meshing or mating with other gears, in order for the Chelsea P.T.O. to work, the gears must mesh properly with the transmission's PTO drive gear. When doing a PTO installation, it is very important, to know the design and specifications of the gear teeth in the transmission.hello. 2016 freighliner cascadia, dt12 transmission. after truck sits over night driver can hear truck attempt to shift into d, but it normally takes approx 10 restarts of the truck to get the truck to shift into gear, only takes approx 2 tries if trying to shift into r, after successfully shifting into gear truck doesn't have any issues shifting. ...Summary: When your automatic transmission doesn't engage or delays, it's time to have someone look at it. Most problems from these symptoms are minor, but it's best to find out for sure so that it doesn't cost $1000's later. 3. Makes Noises: whining, humming or clunking, noisy in neutral.

Detroit DT12 shifting problems Discussion in 'Western Star Forum' started by NorCenArk, Jan 18, 2023. Page 1 of 2 1 2 Next > Jan 18, 2023 #1. NorCenArk Light Load Member. 71 34. Mar 31, 2011 Russellville, AR 0. My transmission revs up between even to odd gear shifts, 4-5, 6-7, 8-9,-10-11.I have 2014 freightliner Cascadia Detroit dd15 engine dt12 transmission problem is truck don’t start showing code 524286 - Answered by a verified Technician ... Hello, this is Keiphun from just answer. We were speaking earlier on your no start issue on your Cascadia. Not sure if we got disconnected or not. Based on the information I have.The most frequent Mazda 3 issue in 2010 and 2011 was clutch failure, which led to acceleration and stalling problems. Even though these model years had about 37,000 miles on their odometers, many owners had to replace the clutch. Drivers have mostly experienced clutch slip symptoms and sometimes even pressure problems in the hydraulic clutch ...Welcome to DTNAConnect, the Daimler Trucks North American secure portal that provides access to the full spectrum of online applications, resources and tools. DTNAConnect is simply the starting point for working with all brands and franchises that fall under the Daimler Trucks North America umbrella.Trucking Jobs in 30 seconds. Every month 400 people find a job with the help of TruckersReport.DT12 Vocational DT12 On-Highway THE DT12 VOCATIONAL SERIES Rugged, reliable and ready to work. Performance and durability under extreme conditions. That’s what the Detroit ® DT12 ® Vocational Series transmissions bring to every job. Our two vocational models – the DT12-V and DT12-VX – are now available in the Western Star 47X, Western Star …Low Transmission Air Warning Pneumatic controls are used to shift the transmission. If there is a loss of air pressure, a warning is displayed and the quality of gear shifts may degrade. Hill Start Aid Feature The DT12 comes standard with a Hill Start Aid feature. Hill Start Aid engages and holds the service brakes of the tractor and trailer on ...Download Detroit DT12 Transmission Service Repair Manual. We Offers manuals high quality images, diagrams, instructions to help you to operate, maintenance, diagnostic, and repair your truck. This document is printable, without restrictions, contains searchable text, bookmarks, crosslinks for easy navigation. Models Covered:Detroit DT12 ...Transmission Control Module (TCM), Diagnostic Trouble Codes (DTCs) Note: For some DTCs, after the component repair is made, the code may not change to inactive status until the compo-nent is activated. Transmission Control Module, Fault Tracing "P1050, Transmission Range, Position", page 5 "P1051, Transmission Splitter, Position", page 6We would like to show you a description here but the site won't allow us.

DT12 rear PTO is a stationary only PTO. If you put the transmission in gear, the PTO drops out. I believe you can program the parameters so the PTO will remain engaged with the park brake released, but still in neutral gear so it can be used for a walking floor application where the load pushes the truck forward.

Once you engage creep mode, you regulate your speed with the brake pedal. The brake pedal in creep mode works just like the clutch pedal in a traditional manual transmission. Once out of the yard, it was time to experience the new DT12 transmission on the open highway. One of the advanced technologies I first experienced was that of the skip shift.If the transmission is removed from the vehicle and the technician notices wear to the clutch diaphragm spring fingers and/or clutch release bearing, perform the clutch system inspection det ailed in the Service Strategy section. Service Strategy: Reference . Endurant HD Automated Transmission. Service Manual TRSM0950. for all service ...Applications: Detroit DT12 transmission used in Freightliner with the DD13 or DD15 engine 3-C. Alternative to OEM W950589006100 Also known as DSN012T20022 Alternative Insert the clutch disc alignment tool (W950589006100) in the pilot bearing bore. Applications: Detroit DT12 transmission used in Freightliner with the DD13 or DD15 engine 3-C.Training video for some of the new Freightliner Cascadia Evolution Automatic Transmission trucks at HO Wolding.If the desired gear and the actual gear do not match, then the PCM will set a diagnostic trouble code (DTC) and illuminate the Check Engine Light. Should either or both of these speed sensors fail, you may notice one or more of the following 3 issues: 1. Harsh or Improper Shifting. Without a valid speed signal from these sensors, the PCM will ...Specs. Recommended for MB 235.11 and DT12 applications. Strong power transfer performance helps maintain longer smooth shifting over fluid life. Formulated to provide protection from varnish formation and wear resulting in improved transmission life. Designed to provide excellent flow properties at low temperatures and greater film protection ...Diamond Truck Sales, Inc - Bakersfield. Bakersfield, California 93308. Phone: (661) 705-6109. visit our website. Email Seller Video Chat. *** ASK FOR LOW COST DELIVERY AVAILABLE TO ALL 48 STATES!! *** SLIDING 5TH WHEEL, TRAILER BRAKE, ENGINE BRAKE, DEF, DIFFERENTIAL, Se Habla Español!Built for vocational performance, durability and low-speed maneuverability, the Detroit DT12-V transmission is ready for any challenge on the work site. It has Off-Road Mode that features aggressive shifting for sustained momentum and ultimate performance on any terrain; Hill Start Aid to guard against rolling back on steep grades; and Rock ...

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If the transmission is removed from the vehicle and the technician notices wear to the clutch diaphragm spring fingers and/or clutch release bearing, perform the clutch system inspection det ailed in the Service Strategy section. Service Strategy: Reference . Endurant HD Automated Transmission. Service Manual TRSM0950. for all service ...DD15 cascadia freightliner 125 sleeper 2 bunks.DT12 rebuilt transmission no miles on transmission and no mechanical problems. leather seats ,new injector seals and lines, new injector railing and... Buy & Sell - Lake City & Live Oak | DD15 cascadia freightliner 125 sleeper 2 bunks.DT12 rebuilt transmission no miles on transmission and no ...Detroit has taken the millions of hours of reliability of the DT12® automated manual transmission and engineered it into two new models designed and tested with vocational customers in mind -- the Detroit DT12-V and DT12-VX. Now your operators can enjoy the rugged performance of the DT12 in pavers, dump trucks, logging trucks and more, no ...(09-25-2021, 08:51 AM) bigcdiesel Wrote: 2015 freightliner with Detroit dd13 and dt12-ob transmission Drives and runs great but will only shift manual Had some issues, mcm was replaced and programmed to truck, was in shop for some time for this, when went to get it out it wouldnt start and had codes for transmission gear position in headway and ...Integrated Communications Benefits: The DT12 ® transmission links engine to axles, and communicates with the DD13 ® Gen 5 and DD15 ® Gen 5 on an integrated electronics network to share damage-reducing information such as clutch overloading and driveline protection. Super-Finished Gears: Tightly-spaced 12-speed gearing, now with "super …Learn how to operate and maintain the Detroit DT12 transmission with this handy poster that provides a visual guide to the main features, controls, and indicators of the system. The poster also includes tips for optimal performance, safety, and fuel efficiency. Download the PDF and keep it in your truck or office for easy reference.1.6K views, 7 likes, 0 loves, 3 comments, 12 shares, Facebook Watch Videos from Diesel Experts LLC: DT12 clutch/shift controller replaceHi sir I have freightliner Cascadia 2015 with Detroit dd15 engine and Detroit dt12 transmission problem is code 521485 fmi2 Gear position sensor problem detected pls help me solution this thanks. … read moreLearn how to operate and maintain the Detroit DT12 transmission with this handy poster that provides a visual guide to the main features, controls, and indicators of the system. The poster also includes tips for optimal performance, safety, and fuel efficiency. Download the PDF and keep it in your truck or office for easy reference.DT12 Transmission 0-60 750,000 mi 1.2 million km No Charge No Charge DT12 Clutch 0-36 350,000 mi 560,000 km No Charge No Charge Detroit Axles 0-60 750,000 mi 1.2 million km No Charge No Charge DD15® or DD13® ENGINE DT12 TM TRANSMISSION DETROIT DRIVE AXLES We all know slowing down is the best way to save fuel, so we’ve …In 2020, Allison announced a significant update to its high-performance fluid standards with the launch of TES 668™, billed as the "next generation" in transmission fluids. TES 668 is specified for all Allison 1000, 2000, 3000 and 4000 series automatic transmissions. To enable our fleet customers to keep pace with this change, Chevron has ... ….

Customer Service. International direct dial: (216) 523-4400 (8a-6p EST, Monday - Friday) Toll-Free (from inside the U.S.): (800) 386-1911.Which auto is it? Freightliners have two options today, a DT12 (or DT15) or an Eaton. The DT style transmission is an in-house design for Detroit, designed to work with the Detroit engine. Overall a good transmission. The Eaton is a more generic transmission, designed to work with a wider variety of engines. Absolute crap in my personal opinion.The VNL I-Shift transmission and the Detroit DT12 each have to produce enormous amounts of power to satisfy the demanding needs of truck drivers. The VNL I-Shift certainly does this thanks to its lb-ft torque rating of 2,300. If you take advantage of the available crawler gears, you get added control and power.Allison World Transmission: MD/HD/3000/4000 series (SAE 10 Bolt) • 3131 Heavy Duty • 3151 Constant mesh: HD • 3252 Low Profile-High Torque • 3131 with rear pump mounting (3131RP) + bracket and 3190 Endurant™ HD • Bottom (8 bolt) models: 2010, 4110, 8500 • Rear (4 bolt) models: 95X Series Detroit™ DT12® • 120X SeriesEndurant XD™ is designed to deliver comfort, drivability, and efficiency in on-highway applications up to 166,000 pounds Gross Combined Weight Rating (GCWR). It is rated for engines with a maximum torque rating of 1,650 to 1,850 lb.-ft. Endurant XD maximizes available power with software that keeps the engine in the appropriate RPM range for load and road conditions and delivers an ...Service Bulletin – Product Page 1 of 4. Subject: Transmission Low Air Pressure and/or Clutch Temperature Display Messages – Endurant Transmissions. Document Number: TAIB-0876 Updated: May 11, 2021 Date: September 17, 2018 Issue Description: Customers may experience a low transmission air pressure and/or clutch …DT12 ™ 12-speed* Eaton UltraShift ® PLUS 10-, 13-, 15- and 18-speed Detroit ™ DT12 ™ 12-speed Automatic Allison ® 3000, 4000 and 4500 Allison ® 3000, 4000 and 4500 SUSPENSIONS Front Freightliner taperleaf 12,00 0-14,600 lbs. Hendrickson AIRTEK ® 12,500 lbs. Rear Freightliner AirLiner ® 21,00 0-23,000 lbs. Freightliner AirLiner ® 40 ...94. 9. Dec 6, 2015. 0. We've got a 2010 International 8600 with an Eaton Ultrashift 10 speed. The other day the driver said the service light came on on the console shifter after a short trip. Today the driver shut the truck off and when tried to restart the truck, it wouldn't start. We quickly figured out the reason the truck wasn't starting ...Freightliner cascadia automatic transmission spn 521485 Fmi 2 , truck not engaging any gear not showing status of gears on screen , tried to clear the codes with service tool, but they keep coming up , it happens when driver left truck over night and lost all air due to air leak in truck , fill the air From air dryer and truck starts and not shifting any gear . Dt12 transmission problems, Engine problems. Besides the transmission issue, engine problems were the highlighted downside of some GMC Acadia model years. These posed red flags for most drivers looking to buy a first-generation Acadia. While the 3.6-liter V6 provided sufficient torque and power, it had a few flaws. Some standout disadvantages included oil and coolant ..., 2015 freightliner cascadia 3AKJGEDV4FSGC9816, DT12 transmission spn 524286 fmi 1 and spn 524286 fmi 4. Clutch minimum and maximum values within spec. While driving empty unit shifts fine when loaded unit is in 12th gear when going to downshift engine idles up and misses 11th gear., Transmission Replacement Cost. Although different things affect semi truck transmission repair cost, in general, the transmissions typically cost at least $1,500 just for the part alone. What’s more, they can run over $4,000, depending on the issues listed above. Then, there are labor costs., Download the commercial vehicle aftermarket catalog from Eaton and find the best clutches, brakes, and parts for your fleet. Learn about the features, benefits, and specifications of Eaton products in this comprehensive PDF guide., Training video for some of the new Freightliner Cascadia Evolution Automatic Transmission trucks at HO Wolding., As the link between the engine and transmission, the clutch is responsible for transferring the engine's torque to the road. The service life of this wearing part depends on a variety of factors - among others the driver's shifting characteristics. A worn or defective clutch cannot be repaired, but has to be replaced at a specialist workshop., We would like to show you a description here but the site won't allow us., A fully integrated powertrain from Detroit - which includes the Detroit DT12 automated manual transmission, Detroit Axles, Detroit Assurance 5.0 Suite of Safety Systems and the Detroit Connect suite of connected vehicle services - provides the most powerful and technologically-advanced solutions on the road today., When you apply the brakes that transmission also applies the clutch just like you would do in a manual. ... Just kidding. I had the same issue with a DT12. Basically I was working it too hard, stopping suddenly while …, The DT12 improves slow-speed maneuvering capabilities without compromising high road speed efficiency. The 12-speed, direct- or over-drive automated manual transmission combines a traditional manual gearbox with high-speed, computer-controlled shift and clutch actuators that automatically and seamlessly select the right shift pattern and clutch engagement for fuel economy and engine power., WARNING!!: ⚠️⚠️⚠️Always use the proper tools and safety equipment to perform this job. Failure to perform the job correctly can result in personal injury or ..., STRUCTURAL SUPPORT WITH INTEGRAL HYDRAULIC MOUNT. Interpump Hydraulics' RS6S-P89M PTO is designed to fit Detroit DT12 transmissions in Freightliner or Western Star Class 8 Cascadia or 5700 trucks. Detroit PTO Prep Kit option 362-822 is required by the transmission. For this unit, the main feature is the integral hydraulic mount for structural ..., MartinAsselin. DES. 10 satisfied customers. 2016 Freightliner Cascadia with dt12 transmission. Start is. 2016 Freightliner Cascadia with dt12 transmission. Start is blocked and says check trans also read there is a low gear sensor failure … read more., TS 1033699: DT12 Transmission Driver Interview: Shifting Complaint Questionnaire TS 1033699: DT12 Transmission Driver Interview: Shifting Complaint Questionnaire Applicable Vehicles: Vehicles equipped with Detroit DT12 Transmissions with shifting complaints Purpose of Solution: Driver interviews are a key component when troubleshooting a vehicle. , Detroit Diesel Corporation (DDC) has determined that some remanufactured Detroit™ DT12™ transmissions will need to be inspected, and have the rear range housing or transmission replaced. Inspection and repair of the remanufactured Detroit™ DT12™ transmission may prevent transmission shifting issues that may result in customer ..., Vehicles equipped with Detroit DT12 Transmissions with shifting complaints Purpose of Solution: Driver interviews are a key component when troubleshooting a vehicle. This …, SUBJECT: Detroit™ DT12™ Transmission Oil And Oil Fill/Drain Plug Washers Note: This document supersedes Technical Service letter 13 TS-38 and 16 TS-16. ISSUE. Detroit™ DT12™ automated manual transmissions use synthetic lubricant, such as Detroit Synth 75W-90, that meets the requirements of the Mercedes-Benz (MB) 235.11 specification., Illinois Auto Truck offers all new, no core, AMT clutch actuators and a solenoid valve. The actuator range covers an actuator for with the Volvo I-Shift and Detroit Diesel DT12 transmissions. The solenoid valve is applicable to the Volvo I-Shift / Mack mDrive transmission. Category: Supplemental Parts. Description., 1.5K views, 50 likes, 0 loves, 1 comments, 2 shares, Facebook Watch Videos from Demand Detroit: The #DT12's clutch actuator ensures smooth, consistent..., loop. that have a inline resistor harness to fix that problem .. Richard Bundy 19 posts since Feb 8, 2015 Re: DT-12 WILL NOT GO INTO GEAR May 19, 2020 3:13 PM DT 12 SPEED SENSOR READS FROM PT CAN . WE INSTALLED NEW ONE ALREADY James McFadden 156 posts since Dec 9, 2014 Re: DT-12 WILL NOT GO INTO GEAR May 19, 2020 3:21 PM , DT12 settings, manual and auto performance disabled. Discussion in 'Trucks [ Eighteen Wheelers ]' started ... Sep 14, 2016 #1. petham Bobtail Member. 4 2. Mar 27, 2013 0. We have a brand new feightliner cascadia. The transmission only has one setting, automatic eco. Why is manual and auto performance setting disabled ? The button to switch ..., Jan 6, 2017 · SUBJECT: Detroit™ DT12™ Transmission Oil And Oil Fill/Drain Plug Washers Note: This document supersedes Technical Service letter 13 TS-38 and 16 TS-16. ISSUE. Detroit™ DT12™ automated manual transmissions use synthetic lubricant, such as Detroit Synth 75W-90, that meets the requirements of the Mercedes-Benz (MB) 235.11 specification. , Oct 27, 2020 · For the most part 12 speeds is over-kill fo any RV, 12 speed transmissions are designed for over the road use pulling 70-80,000 pounds. With the Light weight of our RV’s there is no need for a 12 speed transmission, which is the precise reason nearly every RV is equipped wit 6 speed Allison. Best Regards Mike. , About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ..., The 49X’s combination of the Gen 5 Detroit DD15 engine and the vocational-spec Detroit DT12-V automated manual transmission handled many long and aggressive grades with ease, and with a belly ..., The new Detroit™ DT12™ combines the operational ease of an automatic with the efficiency of a manual transmission, resulting in enhanced fuel economy, vehicle performance and safety. The addition of the Detroit DT12 automated manual transmission and related assembly represented a capital investment of $100 million and resulted in the ..., DETROIT DT12 VOCATIONAL TRANSMISSION SPEC SHEET. Learn about the features and benefits of the DT12 transmission for vocational applications, such as construction, heavy haul and logging. Compare the technical specifications of the DT12-H, DT12-V and DT12-VX models and find out how they can improve your performance and efficiency., It seems like the cold shift issues are a pretty common complaint on the dt12 transmission, especially when under 40degrees. Some drivers say they have noticed a difference turning ECO mode on/off, but since you say it has trouble going into any gear when cold then I would be curious to see where the fluid level is, if it is a little low it will have problems …, THE DETROIT DT12 IS A 12-SPEED, AUTOMATED MANUAL TRANSMISSION WITH SHORTER GEAR STEPS. THE DETROIT DT12 WAS DESIGNED WITH A NUMBER OF INNOVATIVE EFFICIENCY FEATURES TO ACHIEVE OPTIMAL FUEL ECONOMY. Oil Pump. An oil pump, powered by the countershaft, delivers oil directly to the gears. This is more precise, Download Detroit DT12 Transmission Service Repair Manual. We Offers manuals high quality images, diagrams, instructions to help you to operate, maintenance, diagnostic, and repair your truck. This document is printable, without restrictions, contains searchable text, bookmarks, crosslinks for easy navigation. Models Covered:Detroit DT12 ..., HOW TO REPLACE TRANSMISSION OUTPUT SPEED SENSOR TUTORIALJust a quick video from a customers car today speedometer stopped working and got a code for output s..., The notorious issue of trans won’t go into gear. Or check engine light when you try to go into gear. This may be the video for youCome along for the ride and..., The DT12 is a heavy duty transmission that is designed for use in trucks and other large vehicles. It is important to maintain proper air pressure in the transmission in order to ensure that it works correctly and doesn’t overheat. One way to help keep the air pressure low in your DT12 transmission is by using an aftermarket exhaust brake.