I have about 221,000 on my stock trans and a south bend 3,600 DD, Not very nice miles. I have a viration under moderat acceleration. Could it be coming from the Trans? Bearings weiring out? I just want my truck to be as dependible as it has been all thease miles, just wondering if I should get it reabuilt or get a new one (rebuilt one I am asuming?).

 

I'd check the clutch,driveline and everything else first and save a trans overhaul for last. I've even had bad tires make me swear I had a driveline problem - vibration at certain speeds. I put that truck on my bros hoist and ran it at all speeds and we couldn't find a thing wrong. So I blamed it on tires and after a few 1000 more miles the vibration completely disappeared and never came back. Craig

 

Check your center drive shaft bearing

 

the flywheels in our cars like to make noise once they get good and broken in.. idk why.. but do.. cause i had mine do it with all 3 clutchs..

 

I have the one pice shaft and the U joints are good there.

What would I have to do to check the clutch? It is not slipping. I know there is 42,000 on the 3,600 dd.

I can't see it being the tires when it only happens under exceleration. when just crusing there is no vibration. (its like a shudder like when the hanger bearing goes out, but I have the one pice alum shaft.)