6066 (1960-1966) GMC Truck Club

6066 (1960-1966) GMC Truck Club (https://6066gmcclub.com/index.php)

- Transmissions and Rear Ends (https://6066gmcclub.com/forumdisplay.php?f=10)

- - Transmission??? (https://6066gmcclub.com/showthread.php?t=50560)

GTS61

February 26th, 2019 02:39 AM

Transmission???

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

February 26th, 2019 03:07 AM

Re: Transmission???

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

GTS61

February 26th, 2019 04:47 PM

Re: Transmission???

1 Attachment(s)

Thanks Fetch!!

FetchMeAPepsi

February 26th, 2019 05:06 PM

Re: Transmission???

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

February 27th, 2019 04:10 AM

Re: Transmission???

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.

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