im swappin in a 350 tpi from a 91 trans am into my 85 iroc with a stock 305 tpi and t5 setup and i was just wanting to know know real quick are the 91 350s 1 or 2 piece rear mains and will my current stock flywheel bolt right up? thanks

 

91 is one piece, 85 is 2 pc. you need a 1pc flywheel, 153 tooth. Maybe a new clutch and pressure plate to go with it, might as well since its apart.

This is all assuming the 91 has the stock engine. FWIW, a "trans am" never had a 350. the 350 was only available in the gta. Are you sure its not a 305?

 

https://www.thirdgen.org/1991-pontiac-firebird according to this they did. okay so i gotta get a new fly wheel but do i HAVE to get a new clutch and flex plate too?

 

you dont have to get a new clutch, but it would be foolish not to. Nothing like putting the car back together and having the clutch take a dump a month later....

its a pressure plate btw, a flex plate is for a auto trans

and the trans am NEVER had a 350, not a question. That info sheet is a bit misleading because the gta is a "trans am gta".

If the car is a 91 trans am, and has the stock engine, its NOT a 350. the 8th digit of the vin will be a "F" if its a TPI305 and a "8" if its a TPI350. If it has a 350, and the 8th digit is a 8, its a gta not a trans am

i did lie though, you can get the 350 in a formy as well as the gta

 

lol sorry dude i was mistaken its a T Top formula not a trans am but anyways where can get a flywheel for it? I'm searching auto zone and advance auto and all I'm getting is the stock flywheel.

 

you would need a stock flywheel for a 91 trans am with a 305 v8 and 5 speed manual trans. Have them look up that and it will be the right one. Could be any really from around 87 to 92.

check the vin anyway, the 305 and the 350 look identical, and many people think that just because its a chevy v8, its automatically a 350.

 

okay will do and thanks for the help.

 

If you machine the pressure plate so it and the flywheel are fresh surfaces, you can reuse the clutch.

 

You could get a 350 in a Formula, Trans Am and GTA ..

If you machine the flywheel make sure you dont need a shim.