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Mod | | | Forums66 Topics128,024 Posts1,055,390 Members48,422 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jan 2014 Posts: 15 New Guy | | New Guy Joined: Jan 2014 Posts: 15 | I have a 1952 3600 which I am using a 292 instead of the stock 216, I am using the truck to tow my vintage trailer. I was wondering how many of you have used a Muncie m20 . Was it a difficult setup ? | | | | | Joined: Nov 2006 Posts: 2,544 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 2,544 | What rear end are you using? A M-20 is a car transmission and first gear will probably to high. | | | | | Joined: Jul 2008 Posts: 326 'Bolter | | 'Bolter Joined: Jul 2008 Posts: 326 | First gear in a Muncie M20 is going to be something like 2.50 to 1. So it depends on the rear end ratio as Don inquired. The 292 has the torque to pull just about any ratio within reason.
SimS | | | | | Joined: Jan 2014 Posts: 15 New Guy | | New Guy Joined: Jan 2014 Posts: 15 | Was planning a 3.73 but I can change the r&p to anything since the rear end has a 3.42 ? Now. | | | | | Joined: Nov 2006 Posts: 2,544 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 2,544 | Make sure you have a M20, M21 will have a 2:20 1st gear, M20 is 2:56
| | | | | Joined: Jan 2014 Posts: 15 New Guy | | New Guy Joined: Jan 2014 Posts: 15 | Gears are interchangeable ( or so I am told) but I will make sure I have correct first. Thanks for the help! | | | | | Joined: Jan 2014 Posts: 15 New Guy | | New Guy Joined: Jan 2014 Posts: 15 | After some research it is a 1965 m20 . the interesting thing is the gearing was stamped into the case, looks like the same stamp as the date code. | | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | Why not use the SM420 that was stock to the truck? 4th gear is going to be the same ratio as the M20, plus you get a much better 1rst and 2nd gear ratios for getting the load moving.
Bill Burmeister
| | | | | Joined: Jan 2014 Posts: 15 New Guy | | New Guy Joined: Jan 2014 Posts: 15 | Because I didn't think the stock trans would hold up to a 292. | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | Because I didn't think the stock trans would hold up to a 292. I'd guess that an M20 from a car would not hold up better that an SM420 truck transmission (used in 2-ton trucks with big sixes - 302s in GMCs). | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | | | | | | Joined: Jan 2014 Posts: 15 New Guy | | New Guy Joined: Jan 2014 Posts: 15 | OK thanks didn't know that | | | | | Joined: Nov 2006 Posts: 2,544 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 2,544 | The M20 will fail long before the SM420. | | | | | Joined: Jan 2014 Posts: 15 New Guy | | New Guy Joined: Jan 2014 Posts: 15 | Well I can always sell the m20..... | | | | | Joined: Feb 2004 Posts: 29,746 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,746 | I've seen SM-420's in tractor pull rigs handle 600+ HP. The SM 465 will work even better and only requires a different bellhousing hole diameter.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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