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#1
05-17-2004, 08:37 AM
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Re: M-22 I.D.?
The cc3 could indicate a replacement case.
The drain plug isn't a sure clue either. Sounds like the gears are the only way you'll know on this one. With the M-22 gears, you can draw a line between the gears without hitting each other...if you can picture what I mean. What is the casting number? Is there a number on the mid plate starting with a "P" All "661" cases have the drain plug, and even some of the "660" cases. I have a "660" M-21 with a drain plug. Corse spline, or fine spline input? Lack of "rings" on the input doesn't necessarily mean anything either... sounds like a worked over box with a replacement case..  What did you pay for it??
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Dennis 69 Nova 355, M-21, 3.90 12 bolt 68 Chevelle SS 396 4 sp 
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#2
05-17-2004, 09:24 AM
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Re: M-22 I.D.?
Only way to tell for sure is pop off the side cover and look at the cut of the gears,there is a web site on muncie transmissions that will show you the difference in the gears on a M21 and a M22.A lot of M21 trans used the same cases as a M22.There a lot of indications to look for and your trans has all the indications as being a M22! but the only way to know for sure is to look at the gears.
Bobby Dodson
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