I recently installed a new clutch disk and a 4.10 rearend into my 95z. now i have a horrible vibration at about 80 mph. its usually when shifting into 5th. but when if i keep my foot in it i cant notice it after 80 until i let off the gas. drive shaft was balanced last week. new u joints. i have a set of lakewood lower control arms coming and another torque arm. i built an adjustable torque and destroyed the factory one in doing so. so if anyone has any suggestions it would be deeply appreciated. tires are also getting balanced this week.

jon

 

if it wasnt your driveshaft, id assume the tires..........hopefully that will solve it.

 

well.. I had something similar when I swapped my gears...

mine turned out to be the pre-load on the pinion bearings was WAY too loose... I tightened it up and it went away 95%... after I spent $$$ and got a new DS... tore the rear diff apart about a dozen times.. and was very very very pissed off...

 

I bet it's your stock steel driveshaft:blah: