TRANSMISSION JUMPS BETWEEN 45 TO 55 MPH cummins

[MARKB]

My 2000 dodge ram deisel tranny jumps between 45 and 55 mph.I have heard of a electrical issue,need help bad

 

[LAmiller]

Define "jumps"... in that speed range is where the PCM is engaging Overdrive and lockup and if there's a faulty ground to the PCM or on the engine harness going to the transmission, it will cause the transmission to go in and out of lockup and/or OD.

Problem can be often solved by running a separate ground wire from the battery to the PCM ground, and cleaning the ground on the middle of the engine block (drivers side) with sandpaper to assure a good ground going to the transmission. The ground comes out of the main wiring harness and attaches to the side of the engine block on its way to the transmission.

Lavon

 

[BgBlDodge]

Wrap the black and orange wire going from the alternator to the passenger battery in foil.

 

[Billysgoat]

Also clean the battery terminals and make sure you do not have a bad battery