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Check my logic on this driveline noise 700 1990

posted by  Will740turbo on  Fri Aug 5 14:42 CST 2022
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last visit: Wed Oct 22 16:09 CST 2014
[RELATED]

90 740GL w/aw70L and Regina

Had some noise from the driveshaft support bearing at first. Did front brakes, engine and trans mounts, and rear shocks. Driveline noise went from an occasional "buh duh duh" rattle on the highway to an un-ignorable EEEEEEEEE in about 10 miles.

So I pulled the driveshaft apart and did the support bearing and all 3 u-joints. Still have the same exact noise.

I checked the front brake rotor splash shields and the noise does not stop when brakes are applied, including the e-brake.
Rear shocks were original at 240k, engine mounts not terrible, trans mount was terrible. I do plan to do the front struts soon.


My plan now is to shim the carrier bearing, since the whole car was quite soggy before. Buuut do I put it up or down? I can go out and give it a shot, but I'm not sure which way would be better. The rear axle is a little bit lower now than it was with the soggy shocks, so this makes sense to me. I'll put washers between the mounting plate and the center frame rail, not between the bolt heads and the plate.

The last time I saw a link to the procedure, it was no more than 1/2" up or down.

Will update with results. Hm. Maybe there is a rock in the rear brake splash shields...






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