Originally Posted by Mark Kovalsky
Fix the speedometer and the trans will probably go back to normal. The trans uses the speedometer signal to shift, without the signal the PCM can't shift the trans correctly.
Looked through my repair manual, it told me that my truck has no cable but a speed sensor on the rear anti-locks that tells the PCM the speed and shifts according to that. I went out to my truck and something told me to check the fuses, just to humor myself, and see if there might be a fuse for my speed/odometer. Yup, #8...pulled it out and it was blown. I replaced and the digital odometer came on...YES! Had a short errand to run and the truck shifted like it was supposed to. I guess I could have just said it was a fuse and been done with it but I just had to tell what happened. Maybe this can help others with a similar problem. Thanks for the help Mark, you're a life saver! Now to get the fuel gauge to work in the front and probably change the fuel pump and I'll be set. Thanks again!