Muncie 4 speed ID info

**YENKO DEUCE REGISTRY** · #1 11-10-2003, 01:09 PM

661's aren't '66 or '67's! I think they started in '70 and went through '74 or '75?

Sounds like they might be replacement cases.

jus4funn68 · #2 11-16-2003, 05:32 AM

If the case is a 661 and the input has no ring on the splines it would have to be an M-22. The spline number does not matter for that year since they made both fine and coarse spline input shafts on rockcrushers. Kevin

Pantera · #3 11-18-2003, 12:13 PM

I have worked on a lot of these 4 speeds and have never seen a coarse inpuit spline on a rockcrusher M-22. Are you sure of that statment?

JoeC · #4 11-18-2003, 12:25 PM

not all M22 were fine spline
don't go by rings on input shaft to ID a trans
To me, best way is look at input shaft gear.
If it has 26 teeth on 45 deg angle it's M21
If it has 26 teeth on a 20 deg angle it's M22
It it has less then 26 teeth it's M20

Pantera · #5 11-18-2003, 12:44 PM

I have never seen a close ratio to have a "Ring" on it. I would like to see a coarse spline close ratio in a Muncie. They only existed in a BW to the best of my knowledge.

**Kurt S** · #6 11-18-2003, 06:25 PM

*All* pre-1970 Muncies & M22's were coarse splined.
Fine splines were intro'd in 70.

Tim F · #7 11-19-2003, 02:17 AM

I have a coarse spline M-22 built in 72 and stamped CT. Over the counter replacement for 69. 661 case. Tim. [img]/ubbthreads/images/graemlins/

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