If the side plate has the same shape as a Saginaw 4 speed it is a Saginaw 3 speed OD. Some of those were a close ratio 3 speed. That OD is, I think, an R11 and can be put on a Saginaw 4 Speed. I don't know how many different 3 speed ODs were used on Chevys. These Borg ODs are fun to drive. I have a T5 in my pick up but I think the Borg is more fun. Do yours have a 2 bolt mount pad on the OD case?
