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Jul 21st, 2025 | | | | Joined: May 2004 Posts: 204 Member | | Member Joined: May 2004 Posts: 204 | I tried this over in the engine forum but no luck yet. My Father ran across a 4 spd. and called me wanting to post this to get some help on its ID. Here are all the numbers found on it and he says it has some sort of counter-weight on tail shaft. GM-128925856, C-22, 0293, 6261884. I hope this will help identify it.
Thanks in advance!
Mike | | | | | Joined: Feb 2001 Posts: 4,109 'Bolter | | 'Bolter Joined: Feb 2001 Posts: 4,109 | m. smith, i have a hollander interchange book it is a few yrs old but is up to date for our yrs of truck. if he would look at the numbers again they don't read like any gm that i could find. i would be glad to check more. ron
Ron, The Computer Greek I love therefore I am.1954 3100 Chevy truckIn the Gallery 2017 Buick Encore See more pix1960 MGA Roadster Sold 7/18/2017
| | | | | Joined: Apr 2005 Posts: 313 Shop Shark | | Shop Shark Joined: Apr 2005 Posts: 313 | Mike.
Some of the four speed transmissions have the emergency brake mounted on the back of them. That is probably what the "counter-weight" is.
According to my 1963 shop manual, the unit number will be stamped on the rear of the case above the output.
Doug 57. | | | | | Joined: Feb 2001 Posts: 1,094 'Bolter | | 'Bolter Joined: Feb 2001 Posts: 1,094 | If it has the counterweight on the tailshaft it's probably a saginaw, from a vega/monza. Look at the input shaft and see if it has any grooves on it,that will tell you the gear ratios.
Tommy
59 apache 1/2t
261 short stepside
| | | | | Joined: Jan 2005 Posts: 394 Shop Shark | | Shop Shark Joined: Jan 2005 Posts: 394 | could not find any of those numbers in my hollander either..ron what edition do you have, picked up a 37th and 47 edition at a auction.just wondering thanks..mike j | | | | | Joined: May 2004 Posts: 204 Member | | Member Joined: May 2004 Posts: 204 | Got some info. today that it came out of a '76-'78 Camaro. Don't know for sure but that's what a former owner said he took it out of.
Mike | | | | | Joined: Apr 2004 Posts: 158 Shop Shark | | Shop Shark Joined: Apr 2004 Posts: 158 | If it came out of a car, it would have to be an M20 or one of the variants wouldn't it?
If you're interested in drive ratios, all the variants of the M20 are very close together.
Brian | | | | | Joined: May 2004 Posts: 204 Member | | Member Joined: May 2004 Posts: 204 | It's definitely a counter weight, just a block of metal on tail shaft, not e-brake set up at all.
Mike | | |
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