Transmission???

[GTS61]

I’m trying to find out what transmission I have in my 61 305 V6 with 3 on the tree. It’s the original tranny. Anyone know?? Thanks

[FetchMeAPepsi]

Probably the Muncie SM318, but if you post a pic of the cover where the shifter connects I can tell you for sure.

[GTS61]

Thanks Fetch!!

[FetchMeAPepsi]

Nope, that's a 7 bolt (looks like). I *think* that's the Saginaw SM-326, which folks liked better than the 318. If it has 9 bolts, it's a Warner Heavy duty model. I'm guessing that it was replaced at some point. i'm pretty sure the 318 was standard for that year. Congrats on the upgrade!
:upyes:

[LEWISMATKIN]

fetch, you are right. the sm-318/9 had a 4-bolt cover. I did this to two GMC's I have owned over the years. I like the fully syncronized transmission better than the original un-syncronized 1st gear in the 318's.