hey everyone, I have a 1994 Dodge Ram 2500 4x4 Diesel. It's got a 5.9 Cummins Turbo Diesel engine. I think the transmission is a 47RH. The problems I'm having is this:

I start to drive the truck and after the engine warms up my trans temp light comes on. The transmission is about a year old. I have noticed that the truck will not shift into overdrive when the trans temp light is on. The transmission does shift perfectlly when the truck is first run. The transmission shop that installed the transmission said they will not honor their side of the warranty. (I have a lawyer looking into this)

I feel that this is a problem with the transmission coller. I read somewhere about there being a check valve in the cooler or in one if the lines that could be stuck. Which makes perfect sense since the trans will overheat after about 5-10 minutes of use.

If you think it is a problem with the cooler, which cooler, trans pan do you recommend? I was looking at the jegs website and they have some interesting parts. I do tow a trailer sometimes Nothing too heavy. 6 rolled bails of hay at max. An occasional car or so.

I thank you in advance for your replies.

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look at a mag-hytec pan. they have fins built into the pan to help in cooling, plus it is deeper to hold about 1-2 quarts more oil.

it does sound like a check valve might be sticking though.

 

just an update, I removed the return line to the transmission, started the truck, put the truck in neutral and the fluid shot out, so I think I can disregard a stuck check valve. I will check on the sensor tomorrow.

 

another update: Well, after sitting there for 5 hours then starting it up, the trans temp light would not go off. I only messed with the connection today to check it for dirt. Then plugged it back in. I also noticed an inline transmission filter.