Bad vibes help needed - The 1947 - Present Chevrolet & GMC Truck Message Board Network

hotrodhomi · 10-03-2005, 11:17 AM

I have a vibration at freeway speed (65-85 mph). Since I have had the problem I have done the following things to fix it:
I had the tires/wheels rebalanced.
I changed the bakes drums and rotors.
I had the driveshaft rebalanced.
I have pulled my hair out.
WTF

The vibration feels like it is in the back. The engine runs smoothly and I don’t think it is in the tranny. I can put it in neutral or first gear and match the RPMs to my RPMS at freeway speeds and I do not have the vibration.

I am not sure what to do next. Any Ideas?I think I have narrowed the problem down to the rearend. I think its either the differential or the axels.
How much should I pay for a used rearend if I decide to replace it? What years will fit with out any mods. Can I use one out of a 4x4?

My truck is a ’81 2wd swb with a th350 tranny and 3.08 gears.

10-03-2005, 11:17 AM	#1
hotrodhomi Registered User Join Date: Apr 2004 Location: Sacramento Posts: 3,737	Bad vibes help needed I have a vibration at freeway speed (65-85 mph). Since I have had the problem I have done the following things to fix it: I had the tires/wheels rebalanced. I changed the bakes drums and rotors. I had the driveshaft rebalanced. I have pulled my hair out. WTF The vibration feels like it is in the back. The engine runs smoothly and I don’t think it is in the tranny. I can put it in neutral or first gear and match the RPMs to my RPMS at freeway speeds and I do not have the vibration. I am not sure what to do next. Any Ideas?I think I have narrowed the problem down to the rearend. I think its either the differential or the axels. How much should I pay for a used rearend if I decide to replace it? What years will fit with out any mods. Can I use one out of a 4x4? My truck is a ’81 2wd swb with a th350 tranny and 3.08 gears.



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