1996 DODGE RAM 1500

Truck will not shift into 4th from 3rd. I checked Gov Pressure and is a little low,
maxing out around 40psi, too low for 4th (OD). I have 2 codes read when I had
a scanner put in it, P0740 & P0783. One is a TCC circuit and 3-4 shift problem.

Can anyone give me an honest opinion how to diagnose what is wrong and how
major it is? Or not??

I have read online a little but see many differing reasons..... what causes the PCM to
trigger this code??

Thanks, Rich

 

Have you ever found out what cause not those codes? Same issue here on 98 ram van,no overdrive ever.otherwise it shifts fine. I just bought this van and see Dex/merc111 quarts in the back. Wondering I'd its full of this. Its supposed to have atf+3 or 4 ........correct?
Anyway,I'd like to hear what you did to repair

 

ATF+4. And do you know if the tranny was changed with one from another year? BTW, props for searching.

 

I was told it was reduilt...but can't tell for sure. Why do yo ask? If u are asking me?
Just weird that after I reset comp that would throw theses two code simultaniously

 

This thread was started 7 years ago. I don't evben know if the OP is still an active member.

 

You didn't say in your original post that it was working fine before you reset the PCM. So where I was heading no longer matters. All I can say is try resetting it again and see what happens.