My 1996 Dodge 5.9 cummins is having issues with shifting. When I accelrate to about 30 miles per hour, it tries to shift to overdrive, but then downshifts instead. If I ease off the accelrator, it will then shift up to high gear. I don't know if this is a transmission problem or an engine problem. The transmission is rebuilt about 20,000 ago. Any suggestions?

 

check the wiring harness near the alt bracket, also BD sells a resistor that helps with that

 

Moved to the correct section.

 

mine did the same thing picks up noise , i wrapped the harness above the alternator with tin foil and electrical tape. never had that problem again!!!!

 

Thanks for the advice about the tin foil and electrical tape. I'll try it.