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- #21
Yes I ordered the proper one, but as things seem to go for me, the one I need is backordered. The big hole in the bellhousing is called a register. The later GM NV4500s is larger and you cannot use it with the earlier bearing retainer. The alignment is critical for the input shaft, to the degree of .007", if I recall. You may be able to drill new mounting holes but, the transmission will not be aligned with enough precision. An alternative is finding or having an adapter ring machined to center the bell properly, but it would be pretty thin and still needing to drill mounting bolt holes.I don’t blame you for using the AA bellhousing. I was wondering as I am doing something similar although I got my transmission from a local transmission shop. It was supposed to be a ‘96+ case and my adapter from AA is PN 712576.
It turns out that my case is the earlier version with the narrower bolt pattern. I might drill and tap the bellhousing if I am not able to swap it for the right one. Did you order PN712577?