This might be a huge "duh" but there is a lot of second-hand info on what driveshafts work. I thought I'd mention my own first-hand experience. ;-)
The short of it: You can use the E36 328i transmission, flex disc, and driveshaft together, but you need to use the E30 center support bearing. You don't have to do anything strange, like exposing more of the splines of the front section. It is just the right length for the job.
The 328i uses the same transmission as the later model E36 M3, the ZF 320. The E36 328i/is driveshaft (part number 26111227283) fits only when you replace the center bearing and support with an E30 unit. However, you need to use the E36 front (26111226552) and rear dust (26111226553) covers. The circlip (26123648156) is the same.
As for equivalence to the 97+ M3 driveshaft, I have no idea. In principle it should work fine, because the M3 driveshaft is the same length according to the ETK (1492 mm). I think the M3 guibo is beefier. The bolt circle diameter is the same at 96mm according to the ETK, but the guibo bolts are specified 4mm longer than the 328i bolts.
Fred
The short of it: You can use the E36 328i transmission, flex disc, and driveshaft together, but you need to use the E30 center support bearing. You don't have to do anything strange, like exposing more of the splines of the front section. It is just the right length for the job.
The 328i uses the same transmission as the later model E36 M3, the ZF 320. The E36 328i/is driveshaft (part number 26111227283) fits only when you replace the center bearing and support with an E30 unit. However, you need to use the E36 front (26111226552) and rear dust (26111226553) covers. The circlip (26123648156) is the same.
As for equivalence to the 97+ M3 driveshaft, I have no idea. In principle it should work fine, because the M3 driveshaft is the same length according to the ETK (1492 mm). I think the M3 guibo is beefier. The bolt circle diameter is the same at 96mm according to the ETK, but the guibo bolts are specified 4mm longer than the 328i bolts.
Fred
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