Bouncing rear wheel

[USNA1969]

I had my car on jack stands yesterday to lower the back end and decided to spin the rear rotors (took the wheels off) to investigate a growling noise I heard the day before. To my surprise, the left rotor was bouncing up and down about 2 inches. The right rotor was rock steady. Any ideas what would cause that? Please help - the car is sitting in the driveway until I'm sure I'm not going to destroy anything, and the good weather is fast disappearing.

 

[74bigblock]

T-arm bearings. You are in for a treat. Do not drive the car. You will need to remove the T-arm and have the bearings pulled and replaced, or you can get a new or rebuilt T-arm and install that.

 

[Vettehead Mikey]

Never run the car with the rear wheels 'hanging' on the suspension. This is a potentially dangerous thing to do, and proves nothing about the suspension condition. The bouncing you witnessed might be caused by the half shaft u-joints binding on the flanges, a condition that never happens under normal driving conditions. The usual root cause is replacement shocks that are too long allowing the wheel to hang down too far.

As for your growling noise, it could be rear wheel bearing as noted above.

 

[USNA1969]

Thanks for the info. That's good to know. I didn't realize there was a problem with running with the wheels hanging, although it was only at idle.

 

[ON 7TH]

with both rear wheels off & the car suported on the frame with a 6x6 block's of wood i put scissor jacks under the shock/strut rod & take off some off the weight by jackin up the t arm up about 3 inches