The first chevy version of the NV4500 had a different mounting pattern than the rest of the NV4500s. I believe it also had a 5.125 inch indexing bearing retainer. This would be the one with the lower 6.34:1 first gear. As far as I know No NV4500s will bolt straight up to your bellhousing. I agree with Bill that this isn't a NV4500. It might be an SM465 4 speed, or possibly a Clark 5 speed. The Clark 5 speed would bolt up to the sm420 bellhousing, but it may or may not have OD.
As explained above... The dodge 2wd version from 1994-1997 works best for the conversion.
