DT 12 Transmission.

Not sure of the cost but you definitely wanna be sitting down when you find out.

 

take it to detroit dealer. take with you $7k ...

 

Then it should be under warranty and only cost you downtime.

 

Ive never got that in mine. It definatly has its quirks but i have backed down dirt road to deliveries for a couple miles amd it never say its hot

 

If your heating the clutch up let it cool down. Make sure it's in first gear if doing a lot pull ups to get in dock or sliding the trailer tandems.

It has a special downhill mode not everyone knows about. So it doesn't keep shifting gears or goes into E coast. You don't use the engine brake like older trucks on and off on and off going downhill. You turn it on and let it stay on level 1 2 or 3. The transmission will keep slowing down the truck and keep dropping gears. It never stops. So if you have stage 3 on, to stop it from droping gears you have to switch to stage 2 or 1.

Stage 3 will ALWAYS keep the engine RPMs 1750-2200 and it will keep dropping gears to keep that range and keep giving you maximum braking power till you turn it off from 70MPH all the way down to 10MPH. What you really should to it watch the RPMs if the get to 1750 just flip to stage 2 and truck will stay in gear and start rolling faster. Then turn stage 3 on to slow down some.

Stage 1 and 2 are like 1200-1750 RPMs. You can just turn on Descent Mode it will do it everything automatic and you just set the speed you want the truck to hold going downhill

 

To use Descent Mode you turn on cruise control. Then turn on Stage 1 engine brake. Then use the regular brake pedal and slow down to the speed drivers want the truck to go downhill. Here the trick part kinda. Once you get speed you want say 45 MPH. Take foot off the brakes and set the cruise control. This will make the engine brake stay in the current gear. If the truck start going faster, the computers will turn on stage 2 or 3. It also probably will downshift to bring engine RPMs up so you will have maximum engine brake power in stage 3 if that is need to hold the truck speed you set. This also will bypass the normal setting were cruise control will let truck roll 5 or 7 MPH over the set speed limit before engine brakes normal kick in.