output shaft runout

river1 · August 01, 2011, 09:16:09 PM

about the only thing that i see left is front tires/suspension. throw another set of tires on the front just to see what happens?

i haven't seen anything that the collective minds of the RRT couldn't solve so good luck

later jim

kb426 · August 01, 2011, 10:02:28 PM

Is there a chance the rear housing is bent?

unklian · August 01, 2011, 10:07:02 PM

Axle bent/twisted/bowed ?

unklian · August 01, 2011, 10:11:28 PM

Have you tested it on a chassis dyno ?

That would isolate the front suspension.

enjenjo · August 01, 2011, 10:28:03 PM

Quote from: "unklian"Have you tested it on a chassis dyno ?

That would isolate the front suspension.

We ran it on stands up to 70 MPH without the front wheels turning. It vibrated

enjenjo · August 01, 2011, 10:30:10 PM

Quote from: "unklian"Axle bent/twisted/bowed ?

Checked the runout on the rear axles, less than .010", no twist evident.

enjenjo · August 01, 2011, 10:31:46 PM

Quote from: "kb426"Is there a chance the rear housing is bent?

Possible, but not evident.

unklian · August 02, 2011, 12:00:55 AM

Have you tried different wheels/tires on back ?

1800guy · August 02, 2011, 12:13:28 AM

Can we assume that when the car was run on stands, the stands were under the axle tubes, so the suspension was loaded as it would be on the road? Have you tried it with no wheels/tires? How do you check pinion angle with the rear end out (if I read that part right)?

Maybe try an exorcist?

enjenjo · August 02, 2011, 12:23:45 AM

Quote from: "1800guy"Can we assume that when the car was run on stands, the stands were under the axle tubes, so the suspension was loaded as it would be on the road? Have you tried it with no wheels/tires? How do you check pinion angle with the rear end out (if I read that part right)?

Maybe try an exorcist?

Yes, the suspension was loaded on the stands. The angles were checked with an angle finder with the suspension loaded. We tried different tires, and no tires, no change.

32coupe · August 02, 2011, 12:42:44 AM

Try a new trans mount, or support the trans on a jack to take the weight off the mount, try it out.
This happened to me on my last street car.

58 Yeoman · August 02, 2011, 06:56:52 AM

Lugs off center?

Crosley.In.AZ · August 02, 2011, 08:19:55 AM

just a thought

From the posts; you keep looking at the back of the car. Are you sure the vibration is at the back end since it is road speed related?

crdnblu · August 02, 2011, 09:50:52 AM

Curious; have you had all four (4) of the wheels/tires off of the car, & over to a tire shop that can individually spin-balance them to check for a bent or out-of-round rim/wheel? Since the problem is speed related:

(The vibration changes with road speed, but not engine RPM, and is the same when under load or coasting. Starts about 65 mph, and gets worse as you go faster.)

Might this be an issue?

wvcab · August 02, 2011, 10:02:35 AM

he stated in a earlier post that it vibrated while on jack stands....

how are the mounting bushings on the arms holding the rear axle assy?