Identifying a Transmission

Q: Identifying a Transmission

Transmission ID question for a 1967 326 H.O. which has a 3 speed manual trans and I am looking for the manufacturer. The numbers are as follows GM 3925647 , F288 (cast on rt. side) and 18S273731 (on the oval boss rt. side). I don’t know if it is Muncie, Saginaw, Borg Warner ect…

A:
….F288 (This is the date-code: June 28th 1968)
…18S273731 (This is the VIN from the vehicle the Trans camein)
…1968-St.Louis
… Typically, a Muncie Trans would have something like the following stamped in it:
…. P7J25 (P= Trans Type: Muncie, 7= 1967, J= Oct., 25= day)
… Also, up until 1969 the Trans. Arm’s attached to the side w/studs & nuts
…. After 1969 the Trans. Arm’s attached w/bolts.
…. 3925647= Case Number for a 3-spd.
I’m sure there will be other’s who can provide more details on the 3-speed; most of my info is 4-spd related.

A: There were two different 3 speed manual gear boxes available on the 1967 Firebird. The “Standard Three-Speed Manual (Saginaw) Transmission” and “Heavy Duty Three-Speed Manual (Dearborn) Transmission”.

The Warner gear box was ONLY installed on Firebirds equiped with the 400 CI engine. All other Firebirds with three speed transmissions, (including the 326 HO), received the Saginaw gear box.

Unfortunately, neither the 1967 Pontiac Service manual, or Firebird Supplement Manual list the part numbers or codes. However, the information I provided above, comes directly from the Firebird Supplement Manual. So, if that is the transmission that came in your car from the factory, then it is safe to assume it is a Saginaw.

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