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  #16  
Old 12-05-2011, 09:43 AM
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Originally Posted by Ken300D View Post
If I remember correctly from doing a differential replacement, the differential is bolted to the subframe assembly in the back. The subframe is flexible and can move with respect to the frame of the car. It is the rubber differential mount that holds the differential and thus the subframe assembly in place with respect to the frame. I remember having the car up on jackstands in the back - and when the differential mount was removed the wheels sank downward and the differential moved upwards.

So I can agree that the differential should not move much with respect to the frame (thus changing the U-Joint angle) unless the differential mount is worn/loose.

Hmmmm.

Other than outright replacement, is there a way to test the differential mount to determine if it needs replacement? Sure beats replacing the driveshaft.

Ken300D
you are correct, diff is bolted to the subframe, and it's the diff mount that is bolted to the frame, so a badly worn diff mount will indeed allow the driveline to shift.
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  #17  
Old 12-06-2011, 01:37 AM
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Quote:
Originally Posted by kecklc View Post
Well, replaced the rear shocks with Bilstein HD on the back, and replaced the rubber mounts on top of the rear springs yesterday. Overall, not that difficult to do. I was fortunate enough to be able to use a coil spring compressor I had for my 66 Mustang to help removal, took about 3 hours for both sides. I used the thicker 19mm coil spring pads, and it made a big difference in height. Overall, I think the rear came up about 1.5 inches on each side. I know it will settle, but not bad for now. There is still something more to do for the rear, the left side sits a half to an inch lower than the right.

As for the vibration and driving, major improvement. If the vibration is still present, it is barely noticable. We'll see how it is after driving for a while, but I'm happy so far. Next step is replace the driveshaft support, I think it is wise to do so, and probably the rear diff mount.

But, I'm going to drive it for a while with just the new coil spring pads and shocks to see if the vibration stays away.

I just wanted to update the post with some positive results, my opinion for now is the coil spring pads made the difference. Not bad for a few bucks and three hours of labor.
Next time you decide to remove the rear springs, you really don`t need a spring compressor.

remove the shocks, place jack under Differential, remove 4 13mm Diff. mounts bolts. lower diff. and the springs will fall out.

you might need to remove the calipers and hang them to the sway bar so you don`t stretch the brake hoses..

when I changed the Diff mount, Trailing arm and Sub frame bussings, really made a world of difference in the handling. really tightened things up.

Charlie
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