Enhancements of the Detroit DT12 Transmission are highlighted, including optimized gearing and higher overall ratios for improved down speeding and an improved oil system design for increased efficiency.
Only guy who I seen repair these take them apart and repair them in this guy in Irwindale California small shop but the guy knows his shit he must of saved me around a lil over 10 thousand guy took it apart replaced some gears and what do you know 7 months later no problem
As we know commercial trucks are going fully automated with transmissions. It will definitely get more people into the business. It appears these transmissions are non serviceable so if one goes down it’s pulled and replaced with another, the old transmissions are then scrapped and metal recycled which makes sense. Electric and hydrogen powered trucks are fully automatic by design since they use super powerful electric motors. With a computer shifting the gears human damage errors are greatly reduced.
To be honest, out of the automated transmissions on the market, the DT line is the most herky jerky thing I’ve ever driven. Volvo/Mack is much smoother. Don’t know about the new Paccars.
If you've ever seen a Mercedes Benz transmission then you would that this transmission is just that. A big steaming pile of Mercedes shit. Get an Eaton! American made stuff is designed so much simpler.
Eaton Fuller does make great manual transmissions but their automatics leave a lot to be desired. I've driven the ultrashift 10 & 13 speeds which were a horrible experience. The newer 12 speed is an improvement but still doesn't compare to the DT12. My last truck was a 2017 Cascadia with the DT12 which I drove for over 3 years and 600K miles, heavy loads through the mountains and not single transmission problem.
Not really, Detroit Diesel own DT12 is a modified version of Mercedes-Benz truck own powershift3 transmissions (which make sense, they are both owned by Daimler after all)
The I-Shift M-Shift transmissions from Volvo/Mack are based on the Eaton-Fuller Super-10 transmission casings. The DT-12 was finished before Eaton-Fuller finished the Endurant transmission.
