The W59 bellhousing bolts up to the G52/54 just fine. They have the same bolt pattern as a W56/59. I've already had the 3RZ in the truck and bolted up once. This is how I noticed the slave didn't have enough travel.
Anyways, I got out there tonight with some calipers and done some measuring.
The O.D. of the shaft that the throwout bearing rides on is the same diameter on a W56,W59,and G52. I didn't bother to check the R150, but I would imagine it is the same as well.
The early style W/G series bearing (two piece style with cast hub) has the same measurements as the later style W56 bearing. (stamped one piece style). I.D. and length are the same. These should interchange without any problems.
The W59 bearing I have has a .020" bigger I.D. than both the early and late style. It is also about .145" longer than the 22RE bearings from where it contacts the fork to the face of the bearing.
I could probably use the W59 throwout bearing on my 3RZ swap and never have an issue. However I personally don't like it being that sloppy on the tranny.
I bolted up a bellhousing and slave behind my engine hanging from a cherry picker so I could try different options. The easiest solution I came up with to use the older style bearing was to add a couple washers behind the pivot ball on the bellhousing. I added two washers with a combined thickness of .180" behind the pivot ball and now the slave has almost the full stroke of travel. This should work just fine.
I took a bunch of pics of the different bearings. I'll post them up whenever I get them loaded.
