Quote:
Originally Posted by crystalworks
Nice work. Never knew this was a thing. Is that adapter specific to the manual xdrive vehicles? Being inside the trans case I would have thought it would be fairly protected from the elements.
That should have been greased by BMW during assembly. This is the same issue we see with the driveshaft spines wearing out.
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Thanks!
Yes, it is specific to MANUAL, XDRIVE vehicles. And yea, this is very similar to X5s and the front driveshaft splines rusting out.
One thing I forgot to mention is that when I separated the Tcase and trans, a BUNCH of water came out. Probably like 2 to 3 oz. This doesn't really make sense and I'm not sure how water would get trapped up in there. Maybe steam from the cats getting moisture on them? No clue!
At any rate, I agree that some sort of lube NEEDS to be added to the splines in order to displace ANY water that might get trapped, and also to prevent any corrosion. My donor Tcase I picked from the wrecking yard was from an automatic, and it TOO had BUNCH of corrosion on the splines--but they weren't rolled over yet because the splines are still straight. I think with manual cars, the acceleration and decel is more abrupt and causes the splines to wear out from accel and over-run by wheels turning transmission; back and forth...back and forth causing the splines to become razor thin. This isn't helped at all as the splines I think are a little bit looser to help stab the Tcase to the transmission for engagement.