Not sure what type of suspension you have with that year, so I included pictures for both. If you have the spring style where the spring goes under the axle housing, that measurement needs to be taken from the left forward drive. If you have the older "Z" style spring that goes over the axle housing, that measurement is just taken at the back, top of the air bag to the bottom.

Originally Posted by Heavyd

Not sure what type of suspension you have with that year, so I included pictures for both. If you have the spring style where the spring goes under the axle housing, that measurement needs to be taken from the left forward drive. If you have the older "Z" style spring that goes over the axle housing, that measurement is just taken at the back, top of the air bag to the bottom.

Mine is the one that the spring goes under the axle. I'm going out to check this now. Thanks for the help.

Did you check the front and rear engine mounts? Rear gearbox mounts can cause a nausiating vibration under torque.

Ride height was correct. I carried it to a local shop. When I describe the vibration to the mechanic, his first though was pilot bushing. His next thought was trans mounts and u joints since clutch had been replaced by previous owner about 2 months ago. I left it with him he's going to test drive it, check it out to see if he can isolate it. He also has a flatbed loaded with big chunks of concrete to test with a load. If anyone has more suggestions, please pass them on, and I can relay them to him. He is a good mechanic who doesn't mind input. I sure hope he can find the problem. I really love this truck.

Originally Posted by Semi Crazy

I'd check HCV first. Then u joints. Then I'd wonder if the clutch/pilot bearing/input shaft was ever replaced. If original the pilot bearing is overdue could be seized up, wearing tip of input shaft. Any noise during clutch operation?

Thanks for the reply. What is HCV? I got it at the shop now. Mechanic said pretty much what you stated. He's going to check u joints, drive shaft, boxes for metal, engine and trans mounts. checking the obvious first, then moving to the more complicated items if problem is not found.

Check the pilot bearing on the spigot, rear gearbox mounts, ride hight, universal joints, and just to double check, the sync on the yokes of the propshafts.If all is well check the vibration damper on the front of the engine.

Originally Posted by silver dollar

Thanks for the reply. What is HCV? I got it at the shop now. Mechanic said pretty much what you stated. He's going to check u joints, drive shaft, boxes for metal, engine and trans mounts. checking the obvious first, then moving to the more complicated items if problem is not found.

Height control valve. Sometimes they can get knocked out of adjustment or fail

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