5spd in a 79
What motor did the '87 come off of?
IF your '79 is a 300 or 302, and the '87 was a 300, 302 or 351w, it's a match.
IF your '79 is a 351m, 400, 460, then the later model trans must be a ZF from behind a 460--probably not out of an F150.
If it is a 351C, it should bolt up. Pilot bushing size might be an issue, so check that before you try to install. I do not know of a source for that bit of info other than perhaps Numberdummy if you PM him with the specifics. You will have to retro a juice clutch as both the Mazda, which is probably what you're looking at, and the ZF use internal concentric hydraulic slave cylinders for the throw out.
Pics of these transmissions are here, so's you can exactly determine which animal you are getting:
Domestic Truck Tranny Guide







