I recently bought a 2001 4wd Cummins with an automatic transmission. The transmission was slipping in 2nd gear, but all the other gears worked great including overdrive. I swapped a 2wd transmission from a 1997 into the 2001 and now I do not have overdrive. I drove the 97 before the swap, so I know all the gears worked. The swap consisted of installing the 4wd overdrive housing with transfer case on the 2wd transmission, and I had to swap the neutral safety switch due to the plugs being different. I have checked pin 6 (brown wire) at the transmission plug and it has a constant 13-14 volts when driving the truck. The pcm isn't sending the signal to the overdrive solenoid. Where do I go from here? Is the 97 transmission temperature sensor different from 01?

Edited August 7, 20195 yr by jeremy175

The rest of the wiring loom needs to be swapped too the pins are not the same order, there is wiring differences. 

 

Edited August 12, 20195 yr by JAG1

I am almost positive the 8 pin connector on both trucks are the same. I just ohmed the trans temp sensor in the 97 transmission and it reads 1k ohms then I ohmed the trans temp sensor in the 01 transmission and it reads 2k ohms. Does anyone know if they will interchange?

The transducers are different between the two years. You'll have to put the right transducer in it.

I ended up swapping the transducer and wiring harness inside the transmission which fixed overdrive and lockup.