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Aluminum 4 speed Muncie.
#1400641 03/09/2021 3:48 AM
Joined: Nov 2002
Posts: 394
Quartz Hill California
O
ol' 55
Offline
'Bolter
ol' 55
'Bolter
O Offline
Joined: Nov 2002
Posts: 394
Quartz Hill California
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.......
Re: Aluminum 4 speed Muncie.
ol' 55 #1400648 03/09/2021 6:12 AM
Joined: Mar 2006
Posts: 319
KS
R
randyl Offline
Shop Shark
randyl
Shop Shark
R Offline
Joined: Mar 2006
Posts: 319
KS
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
Re: Aluminum 4 speed Muncie.
ol' 55 #1400805 03/10/2021 3:20 AM
Joined: Nov 2002
Posts: 394
Quartz Hill California
O
ol' 55
Offline
'Bolter
ol' 55
'Bolter
O Offline
Joined: Nov 2002
Posts: 394
Quartz Hill California
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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