Muncie 4 speed ID info
 

Can anyone tell me how to identiify these trans?

PO422
PO204
This numbers came from the right side if trans is facing forward. stamped in.

Thanks [img]/ubbthreads/images/graemlins/worship.gif[/img]

Re: Muncie 4 speed ID info
 

P=Muncie
O=1970
4=April
22=Day

P=Muncie
O=1970
2=February
04=Day
You have seem to have missed the last letter in the code
A,B or C.
The "MOF"

Re: Muncie 4 speed ID info
 

Case is extremely clean and there are no other letters or numbers but the input shaft has no rings cut in them.

Re: Muncie 4 speed ID info
 

Is the input shaft a fine spline or course spline shaft.
What is the size of the output shaft,Does it have a LARGE counter pin located in the front of the trans or a smaller pin.I compare the rear shaft size to a TH-350 Yoke or TH-400 Yoke.No grove and 1 grove is close ratio and 2 groves would be wide ratio."MOF"

Re: Muncie 4 speed ID info
 

These are either 1965 or 1966 model year Muncie's. 1967 and later used a letter code for the month. 1963 1/2 and 1964 had the P-code on the left side. If you could post the main case casting number I could give you the model year... Crash

Re: Muncie 4 speed ID info
 

one one of them it is 3952661 I'll have to get the other one from my buddies shop.

Re: Muncie 4 speed ID info
 

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.

Re: Muncie 4 speed ID info
 

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

Re: Muncie 4 speed ID info
 

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?

Re: Muncie 4 speed ID info
 

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

Re: Muncie 4 speed ID info
 

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.

Re: Muncie 4 speed ID info
 

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

Re: Muncie 4 speed ID info
 

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/3gears.gif[/img]

Re: Muncie 4 speed ID info
 

Seems to be a lot of mis-information in this thread..
Maybe this will help [img]/ubbthreads/images/graemlins/scholar.gif[/img]
http://www.gearzone.net/muncie2.htm
[img]/ubbthreads/images/graemlins/beers.gif[/img]

Re: Muncie 4 speed ID info
 

Thanks for putting the gearzone site on here Zman. [img]/ubbthreads/images/graemlins/biggthumpup.gif[/img] The information on this site confirms what I was trying to say earlier. If you check the years that the 10 spline ended and the 26 began for rockcrushers, 69-70 has overlaping production. Kevin

Re: Muncie 4 speed ID info
 

>Year 1969-1974 Type: M22 Rings: None Spline: 26

I don't agree with that and neither does Colvin. Colvin went thru the Muncie records, it's all in his CBTN books.
The fine spline was launched on Chevelles with M22 in 70.
Fine spline became available in 71 on the M20 and M21.
*ALL* 69 Muncie 4 speeds had course splines.