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Re: Two piece driveshaft in a 750iL? (archive)

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Posted by alex lynch on April 06, 2001 at 21:42:54:

In Reply to: Two piece driveshaft in a 750iL? posted by Rich 1990 750iL on April 06, 2001 at 19:58:08:

Positive. Most, if not all, BMWs use two-piece driveshafts. This design helps to isolate vibrations in the drivetrain. Most E32 models have a u-joint at the transmission end, a u-joint in the middle, and a constant velocity joint at the differential end. The problem is that the u-joints are staked onto the driveshaft and cannot be replaced without the use of special tools. Also, since the driveshaft is two separate pieces, it must be dynamically balanced if the u-joints are replaced to ensure that the whole unit rotates evenly. This also requires special equipment.

You can either purchase a rebuilt driveshaft for between $400 and $500 or a new one for between $500 and $600. My personal choice was a new driveshaft since the cost is not signficantly higher and I have heard of some problems with rebuilts.


Alex Lynch

I've read on this board, as I recall, that the 750iL has a driveshaft that is a piece and can't be re-worked. Are you sure, Alex?

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