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8 members (TS3600, cmayna, Opelika Tom, Otto Skorzeny, TexasJim50, klhansen, Shaffer's1950, Oswald),
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Mod | | | Forums66 Topics128,077 Posts1,056,281 Members48,441 | | 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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Nov 2002 Posts: 394 'Bolter | | 'Bolter Joined: Nov 2002 Posts: 394 | Need some info. on a 4 speed muncie we are now looking to purchase. It has a U.S. patent #8088336, there are (2) numbers stamped on the case, they are #3885010 and # 6K116565, side cover is 3831707 and the tailshaft housing # 3857584.. Just need to know is it a M-20 or M-21 and the year? Thanks....... | | | | | Joined: Mar 2006 Posts: 319 Shop Shark | | Shop Shark Joined: Mar 2006 Posts: 319 | 6K116565
6 = 1966 model year
K = assembly plant
116565 = production number
M20 has 2 grooves or rings on the 10 spline input shaft.
M21 has 1 groove or ring on the 10 spline input shaft.
"Nothing astonishes men so much as common sense and plain dealing." - Ralph Waldo Emerson
| | | | | Joined: Nov 2002 Posts: 394 'Bolter | | 'Bolter Joined: Nov 2002 Posts: 394 | By chance there Randy would you know what the gear ratio's would be in this here trans.? It does have (2) rings meaning it is an M20.Thank you..... | | |
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