i've got an 89 trans am 305 tpi... the alternator went out..... i've got an 86 z28 w/ a 305 carbed motor..... any reason i can't swap the alternator out of that into my trans am?

 

According to www.acdelco.com, the parts list for alternators for each car you have show different alternators. Your '89 is 105 amps, unless it's an anniversary model, which has 120 amps, and your '86 has either 78 amps or 94 amps--probably 94 since it's a Z28.

So it'll likely fit, and it might even work well enough to drive the car, but it probably wouldn't power everything strongly enough to be reliable and last. But I'm no electric guy, lol.