I have an 89 trans am 305 auto. I am looking to convert to a manual trans. I have done this swap on my 68 and 81 camaros in the past but not on a gen 3. I have a spare muncie 4 speed which i am told will not work. is that right? What manual trans' work for this swap and which vehicles can i scavenge them from?
Thank you.

 

I would look for a upull junkyard, and get a 4th gen t5. If you have a v8, obviously try to get one from a v8, the bellhousings aren't interchangeable. As far as i know, ALL the 4th gen v8's are WC t5's, for what that's worth.
As far as the muncie, I have heard that the gearbox will line up to a Camaro style bellhousing, with some work. The difference is that the Camaro bells are angled towards the driver.
https://www.thirdgen.org/manualswap/
This is the basic article to to the swap, but since you've done it on gen 1 and 2, it's kinda the same.

 

I'm not sure where you got your information, but exactly ZERO 4th gens came from the factory with a V8 & a T-5.

Unfortunately, the F-body transmissions & bellhousings are unique to F-bodies, so you need to find an F-body donor car.

T-5 is the transmission you want. If you have a V8 you should really try to find a V8 trans, if you have a V6, a V6 trans.

They upgraded the design in 85 I believe to a world class T-5, so if you have the choice, go with a later transmission, although in a pinch an older one will work, and will fit in the car the same, but will be weaker.

 

yea, I was halfway asleep on the 4th gen bit, I was thinking of the v6's, my bad.
If I post anything past 730pm, I'm probably overtired and wrong.

 

Hahaha, no worries I have been there. Decide to jump on the forums late at night when I'm tired and/or drunk, post something silly.