RE: [Chevelle-list] Clutches

[Dale]

350's weren't introduced until 1967 so it was either a 283 or 327 car when it was built.   And even then, not in the Chevelle in 1967.  If you look at the case and tail shaft housing, there should be some casting numbers if it’s a Muncie.  Assuming the internals hadn’t been completely changed, those numbers should help identify the year-range of the trans and the model (M20/M21/M22).  With that info you should be able to determine the spline count for that particular year.  See http://www.chevellestuff.com/generic/muncie.htm for a list.   Basically (if it’s a Muncie) 63-early 70 M20/M21s have a 10 spline, late 70-74 M20/M21s have 26.  Probably not a M22 so I won’t go there but info the link above will help.   Dale