BIG J MIXALOT

i have a vibration its not coming from the front i thought it was tires so i got new ones and it still vibrating anyone know what it is and it starts around 30mph

rxtasy3

iTrader: (2)

possibly a bad U joint.

74RX4

iTrader: (10)

U-joint is a good possibility, but I'd check the tranny mount first. $15-17 from Rock autoparts.

Redline-RX3

iTrader: (5)

An easy check to see if its the rear u-joint is to just get the car up to a decent speed (over 30) and push the clutch in. If the vibration persists even though engine rpm has dropped to idle , then chances are its the rear u/j. It will get worse the higher the car speed...if vibration is reduced or gone then yeah its trans or motor mounts.

BIG J MIXALOT

ill try it tomarrow if its u joints should i get a new driveline from junk yard

rxtasy3

iTrader: (2)

gradually increasing engine rpm while sitting still will also determine if it's engine/tranny mount related. but i have done the same thing, pushing in the clutch while going down the road to determine where a vibration is coming from.

BIG J MIXALOT

i was doing that today and it was not doing anything so it must be the u joints then

estrada42

What if you have a bad vibration at 30+, vibration stays when clutch is in and coasting at any speed.

Thought it was a rear U-joint, so I replaced that.

Checked all tires for balance.

174k on an 82 GSL. The car drives great and handles fine, but the vibration is almost making it undriveable.

OneRotor

iTrader: (3)

put the car up on jackstands and go through all joints. At 174k you're probably looking at new ball joints, inner and outer tie rod ends, both u-joints, springs/struts, etc.

Whisper

Could be front U-joint or the whole driveshaft is out of balance.

wesmcbride

iTrader: (2)

check your brakes