My truck when it shifts into overdrive it shakes. I have replaced the torque converter, distributor cap, plugs, plug wires, and the ignition coil. When it starts to shimmy I can turn off the overdrive and it goes away. What else could it be? The truck is a 1997 1500 4x4 5.9 engine. Thanks!

 

Welcome to DF. Please read. https://dodgeforum.com/forum/2nd-gen...new-topic.html

Need specifics on your truck as the rules for new posters requests.

 

That usually means you have a power problem. Read the plenum sticky.

 

Misfire. ^Plenum and re-route your plug wires per the TSB that is still floating around here somewhere.