Safe to say this trans is an M22?

http://photos.zweezy.com/img_134d5ad...090507a448.jpg

http://photos.zweezy.com/img_c77f2ff...2f23b0088e.jpg

http://photos.zweezy.com/img_7966335...4a277a8a09.jpg

 

No. The 1704 is a '63 case only. Way too early for the M22.

 

Was drain plug standard in 63? Enough info in the photos to determine close or wide?

 

Take the side cover off and show us the gears. D.C.

 

Thanks, but we were able to identify it.

The trans was a '63 only M20. This one was in a '63 Vette built in July, 63.

 

3113706 is stamped on the housing in the picture of the side cover....I'm thinking its 63 tranny.

 

Some additional info.

USUALLY, but not always, an M22 can be determined by EXternal features and/or codes. But as I said, NOT always.
ANY Muncie can contain ANY gear set--------------------especially when a rebuilder such as myself gets ahold of it. NO, I AM NOT a bubba. I am EXTREMELY familiar with Muncies (been building them for almost 45yrs) and I've seen and done many things with them.
So, as mentioned above, The ONLY way to determine if a particular Muncie is an M22 is to remove the side cover and eyeball the gears. PERIOD! I do not care if a case has A, B, C stamped after the date code, because if at sometime in its past someone broke it, and could not locate, or could not afford replacement M22 gear(s), then they may have swapped out the whole gear set with either M20 or M21 gears. Thus, a case stamped with a C MAY not be an M22.
Also, conversely, ANY Muncie case could contain an M22 gear set simply by installing the gears. Oh wait a minute--------------so you say M22 clutster gears were only the 1in shaft version? Correct! Thus it is impossible to make a 63-65 case into an M22? WRONG! Simply have a 7/8in case bored out to 1in and install a gear set with a 1in cluster gear. TOO EASY! I've done this to several 63-65 Muncies. Therefore, IT IS POSSIBLE for a 63 Muncie case to contain M22 gears! Which brings us all the way back to how do you confirm if a Muncie is or is not an M22? Pull the side cover and look at the gears. Period!

Tom Parsons

 

Well put. D.c.

 

M20/M21 and M22 gears shown below; top photo is M20/21, bottom photo is M22.

 

Tom & John, any recommendations on who to get a rebuild kit from?
67 M20, I'd like to get one without Chinese bearings.

 

I buy ALL my 4sp parts from Larry Fischer of D&L Transmission. http://www.dandltransmission.com/
I've been doing business with Larry for nearly 30yrs and I can't say enough about my dealings with him.
Yes, there are other sources, but Larry would be difficult to beat.

Tom Parsons

 

John,
EXCELLENT picture/comparrison!

Is it OK if I save it?

Tom Parsons

 

Thanks, Tom.

I will go there, reasonable pricing,too.

 

A common mistake is thinking that all "fine spline" 26 spline input shafts are M22 heavy duty types which they are not.

Another misconception is if you have a drain plug you have an M22. That may be true on the first initial boxes but all 3925651 cases use the drain plug and they are not M22s.

 

Sure - be my guest.

 

Dan is EXACTLY correct!!!
ALLLLLLLLLLLLLLLLL 71-74 Muncies got the 26 spline input shaft and the larger, 32spline tailshaft--------------regardless of M20-M21-M22.

Unless a customer specifically does not want a drain plug (and in 40+yrs I've only had one decline), I REMOVE the magnetic donut in the bottom of the case and install a magnetic drain plug. So, if a Muncie comes off of my workbench, it's got a drain plug. And I know that other rebuilders have installed a drain plug for customers. Thus, if a Muncie case has a drain plug, that does NOT make it an M22.

Tom Parsons

 

Thanks John.

Tom Parsons

 

I see subtle differences, but is there a big difference that Im not seeing? Obviously Im not a transmission expert. just curious (in John Z's pictures).

 

Just wondering what the S/N is on the 63 this trans is attached to, my July 24th, 1963 built coupe is 20396. thks D

 

If you look closely at the angle of the teeth, and laid a straight edge at the root of one tooth on the M22, it would almost (but not quite) come out at the top of the corresponding tooth next to it, whereas on a M20/21 the straight edge would come out roughly in the middle of the tooth next to it. Clear as mud? anyway if you know what to look at it is very easy to tell.