Deceleration dive...

[Rescue 1]

Okay got a question for you driveline guys. We have a 1972 Chevy 3/4 ton 4X4, with 14,000 original miles.

Here is the problem, while driving the truck under acceleration it goes straight down the road, however as soon as you lift off the fuel pedel it dives to the right. I don't mean a small pull, I mean it heads for the ditch.

We have checked the following, both front tires, both front wheel bearings, rear brakes, front brakes, steering gear box( tight), pitman arm(tight), tie rod and ends, ball joints (upper and lower), motor mounts, rear axles(truck does have posi), front axles, locking hubs, etc. Everything that I can think of to check that has anything to do with the steering.

Any help or guidance is greatly appreciated. BTW this is not a new problem this truck has done this for awhile(several years). Considering it is a firetruck it doesn't have many miles so I don't see how many things can be worn out. I realize that it is hard to diagnose a problem by my descriptions, however if you email me or post a question for me here I will do my best to answer it, Thanks.