73 Muscle

Thanks Jim. I posted a WTB listing in the Classifieds. Hopefully I'll receive some good news. I'll work on putting together a progress report.

Very useful info. Thank you. I've started my search for a 73-PR case.

Newbie here. I am one of those lucky people that own (2nd owner) a 73 true Brewster green T/A which is currently undergoing a frame-off restoration. The numbers matching 455 engine and the differential have been rebuilt. As I was examining the TH400 trans my heart sunk after discovering that it was not numbers matching. It came off a 78 Oldsmobile. I realize that I will never find the original tranny but would like to install one from a 73 Firebird/Trans AM. I am by no means an expert but did some research pertaining to the 73 Pontiac trannys and found out that the plate/tag that is riveted to the case should read 73-PQ. The “P” is for Pontiac and the “Q” is for the A & F series, 455, 4BBL SD, Firebird, Le Mans & Grand AM vehicles. Also found out that a 73-PR tag reflects a 73 TH400. The “P” is for Pontiac and the “R” is for the A & G series, 455, 4BBL, Firebird, Le Mans & Grand AM vehicles. Based on my findings, both the 73-PQ and 73-PR TH400 are compatible with the Firebird, which is confusing. Can someone advise me if my findings are accurate and what the correct tranny code would be (73-PQ or 73-PR). Also, is there anyone out there that has a 73-PQ or 73-PR core or case for sale? Thanks