cptrucks.com

Any more ideas?

Rick-Rat: You are correct the truck is owned by a fellow in Texas our shop is in Texas. It was put together from someone in Cali and Vegas. It was restored for a Doctor and then sold to a Museum. Our customer bought it from Ebay last year. Im not sure who built it. But so far this is been helpful info. I have since found out that there never was a 620 4wd. datzenmike: It definitely has locking hubs in the rear just like in the front. I've never thought about the gear ratios. That shouldn't matter though with either of them unlocked. Hooligan: It would explain the bucking if both the front and rear were locked at the same time.

When you lock the rear in and the front out at highway speeds the truck for lack of better terms "buck s" and "jumps" I have no idea where to start. When you lock the front in and the rear out the front grinds and pops like no tomorrow.

I have a customer with a 620 truck "I think" that has an issue I am unfamiliar with. I know nothing about these trucks. Does anyone have a good shop that I can call or talk to about this truck? Here is the truck in question... Thanks in advance for any help.