Mucie 4-Speed casting 3925660
#1
03-01-2011, 05:53 PM
Mucie 4-Speed casting 3925660
how do i determine if 4 speed is a M20, M21 or M22
its casting is 3925660
after researching the casting it appears that the code is the same for all 3
Casting: 3925660 Years: 1968 - 1970 Ratios: M20 2.52 1st , M21 2.20 1st, M22 2.20 1st
its casting is 3925660
after researching the casting it appears that the code is the same for all 3
Casting: 3925660 Years: 1968 - 1970 Ratios: M20 2.52 1st , M21 2.20 1st, M22 2.20 1st
#2
03-01-2011, 07:25 PM
Look at your input shaft. M20 has two grooves on it, M21 has one groove on it, and M22 has no grooves. This is assuming of course it has never been taken apart and changed.
#3
03-01-2011, 07:37 PM
Join Date: Oct 2007
Location: The 'Burbs of Chicago
Posts: 18,306
Thread
Thread Starter
Forum
Replies
Last Post
