901 vs 915 Tranny

[MdR]

Originally posted by Shad Laws

We still haven't talked about the 911/01 trans, it's a mix of the 901 and 915 for '70-'71 only. As I understand it, it's a 915 with a 901 bellhousing so it's a good way to go but much harder to find.

Not quite.

Beginning in Aug. 1969, Porsche did use an updated transmission from the 901 called the 911. However, it is basically a 901 with a slightly reinfornced casing. Not *that* huge of an improvement in the durability/strength/etc. department, but notable nevertheless.

A useful difference between the 901 & the 911/01 is that the latter has a bellhousing similar to a T1 in that, unlike the circular 901 (or 915), it has 'flats' cast in (just like a 914/4) to allow easier fitment of the rear hanger.
This is a good thing.