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Old 02-11-2018, 08:41 PM   #1
Tonner
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Transmission ID

This is a 3-speed automatic that I pulled out of my '72 C20. I assumed it was a TH350, but the guy at NAPA said that truck with a 350 V8 could have 8 possible transmissions. Where do I scrape to find markings? Can you ID it just by pan shape?
Thanks.
https://drive.google.com/file/d/1tOC...ew?usp=sharing
https://drive.google.com/file/d/1-8f...ew?usp=sharing
https://drive.google.com/file/d/1CC2...ew?usp=sharing
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Old 02-11-2018, 08:48 PM   #2
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Re: Transmission ID

http://67-72chevytrucks.com/vboard/a...1&d=1518396470
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Old 02-11-2018, 08:50 PM   #3
B. W.
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Re: Transmission ID

turbo 350
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Old 02-11-2018, 11:11 PM   #4
Tonner
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Re: Transmission ID

Awesome, thanks!
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Old 02-12-2018, 09:10 AM   #5
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Re: Transmission ID

Yes TH350 and I’d stand in line at NAPA at someone else’s register. There were only 2 three-speed automatic transmissions available. 350 and 400.
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Old 02-12-2018, 10:37 AM   #6
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Re: Transmission ID

And if you have one as pictured with the Monster label on it you are likely in deep poo poo. Search "Monster complaints" to read the nightmares.
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Old 02-12-2018, 11:54 AM   #7
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Re: Transmission ID

Good to know. It's original, so I think I'm ok.
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Old 02-13-2018, 03:03 PM   #8
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Re: Transmission ID

not to hijack this thread but i have a 4 speed manual with a 307 . any ideas what that is because every one just calls it a 4 speed.
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71 gmc c15 307 sbc 373 rear gears positrac m20 trans
94 chevy k1500 350 tbi 373 rear gears 4l60e one wheel peel. Gutless
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Old 02-13-2018, 03:18 PM   #9
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Re: Transmission ID

It's either Muncie or New process [rare]
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Old 02-13-2018, 06:17 PM   #10
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Re: Transmission ID

Ok safe bet to say Munice. Nothing specal about my pickup. But is thare an esay way to tell wich one it is that doesn't involve scraping 47 years worth of greas off it. Like is the pan differnt?
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71 gmc c15 307 sbc 373 rear gears positrac m20 trans
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Last edited by 71gmcC15; 02-13-2018 at 06:23 PM.
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Old 02-13-2018, 06:56 PM   #11
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Re: Transmission ID

http://67-72chevytrucks.com/vboard/a...18562471562471

new process top
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Old 02-13-2018, 09:27 PM   #12
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Re: Transmission ID

Here's a good thread to ID the SM465. This is different from a car trans - has a granny low/1st. http://67-72chevytrucks.com/vboard/s...d.php?t=457810
If original, it should be on the SPID - as "M20" I believe - it was not standard equipment, lack of mention on the SPID would mean the truck was born as a 3-speed.

Last edited by jocko; 02-13-2018 at 09:41 PM.
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Old 02-13-2018, 10:20 PM   #13
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Re: Transmission ID

Quote:
Originally Posted by jocko View Post
Here's a good thread to ID the SM465. This is different from a car trans - has a granny low/1st. http://67-72chevytrucks.com/vboard/s...d.php?t=457810
If original, it should be on the SPID - as "M20" I believe - it was not standard equipment, lack of mention on the SPID would mean the truck was born as a 3-speed.
Thanks. Is it differnt for gmcs as standard equipment becuse my spid doent menchin it but it looks factory. Has the correct trans tunnal ,steering colum,and the cluch pedal also looks original.
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71 gmc c15 307 sbc 373 rear gears positrac m20 trans
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Old 02-13-2018, 10:32 PM   #14
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Re: Transmission ID

4-speed should be listed on the SPID for Chev or GMC as it was an optional trans. Here's a couple GMC SPIDs for ref. These truck are so old that something swapped in 20 years after it was new can look original at this point, ha. But you never know, SPIDs have had mistakes before!
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Old 02-13-2018, 10:54 PM   #15
71gmcC15
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Re: Transmission ID

Who knows for sure maby it was swapped in from another 67-72gm truck. That would explane all the correct parts.
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