My friend has what we believe to be an M22 - It has been in his garage for 20yrs. It has fine splines front and back. Here are the numbers

VIN 21N103860

This number is beneath the vin
P1M28C

Case 3925661

Just wondering what it is for sure and what it came out of - also any idea what it may be worth, thks.


Thks

Rich

built august 28 1971 M22

Thks Tony any idea what car it came it of?? Also how did you come up with August, thks.

Thks

Thks Tony any idea what car it came it of?? Also how did you come up with August, thks.

Thks

P1M28C

P is Muncie Plant

1 is the year - 1971

M is August

28 is the day

C is M22

No idea what car it came out of

Thks - I think it possibly may have came out of a Norwood built car by the N in the vin - possibly a Camaro?? Firebird??- any one else with idea's???

Thks

Rich

Thks - I think it possibly may have came out of a Norwood built car by the N in the vin - possibly a Camaro?? Firebird??- any one else with idea's???

Thks

Rich

I dont think the N means that but maybe someone can confirm. BTW the case number was used 1970 -74 for all three models.

21N=
2-Pontiac
1-1971
N-Norwood
Trans is from a 1971 Trans Am, which in '71 were all 455HO cars.

Here is what the guts of a M22 look like...the M21 angle of the gears is not as /// like the 22's are...I would remove the inspection plate and check the guts cause many of them have 21 gears in them...changed out from being abused...etc...those Muncie guts belong to an LS6 boys...:thumbsup:

There is a Pontiac guy somewhere that is looking for that particular tranny I bet...and would pay a premium for it...

http://www.oklahomawildbunch.com/OWBPIC/M22.jpg

Those T/A's SD's are going for High $$ , could be worth a lot to the right buyer.

Exactly right on Jim...those cars are bringing crazy money cause they are rare old birds...hahaha...that is what I was trying to say...

Here is what the guts of a M22 look like...the M21 angle of the gears is not as /// like the 22's are...I would remove the inspection plate and check the guts cause many of them have 21 gears in them...changed out from being abused...etc...those Muncie guts belong to an LS6 boys...:thumbsup:

There is a Pontiac guy somewhere that is looking for that particular tranny I bet...and would pay a premium for it...

http://www.oklahomawildbunch.com/OWBPIC/M22.jpg

But the LS5's are better. :p

I know that had no contribution to this thread but I had to say it anyway. :D

Hi Rich,
As Dave and others have told you, your trans case is coded for a 71 Pontiac Firebird, but the assembly date you have indicates a build of August 28th of 1970, not August 28th of 1971. These cases are stamped for the model year they were intended to be used in. If this case was actually assembled August 28th of 1971, it would have been stamped P2M28C for use in the 1972 model year and would have a V.I.N. starting with 22N1XXXXX. I know this sounds confusing but each plant used it's own method of date coding parts and this was Muncie's method. Your trans is actually a pretty early production unit.
Hope this helps, Chris

Thks Guys - appreciate all your help.

Rich

But the LS5's are better. :p

I know that had no contribution to this thread but I had to say it anyway. :Dyour right, the LS5 didn't have the power of the ELLESSSIX:D:noway:

your right, the LS5 didn't have the power of the ELLESSSIX:D:noway:

True, dat, but you didn't have to change the plugs as often either :beers:
And yes, I've had them both.... :D

I'll take my LS5 with an LS6 cam, different intake, a Holley, and a good set of headers. It can just as hard. :D

And by the way I have both. Well the LS5 is actually my dads but I've got a 1970 LS6 awaiting a rebuild and a home. So :p

Comparison photos (same size & same camera angle) of M20/M21 vs. M22 gear sets

http://www.chevellestuff.com/generic/muncie.htm

that was interesting looking at those pictures thank you sir.

An M22 trans will have a drain plug on the side.

An M22 trans will have a drain plug on the side.

True, until 1970. ALL finespline input Muncies have a drain plug, regardless of what gearset is in the case. :hurray:

Sounds like a nice item you have there.

Very nice pictures and great info gentlemen.

what sucks is they made both course spline little shaft, and fine spline big shafts, both m22 and m21s

what sucks is they made both course spline little shaft, and fine spline big shafts, both m22 and m21s

True, this is why I've studied Muncie-ology and know what's what with them. I can put one together blindfolded. As a general rule, Pre-1970 is coarse spline, and post-70 is fine spline. Beginning sometime in the 68 model year, they started adding the suffix A, B, or C to the date to indicate M20, M21, or M22 respectfully. I need to write a book from my notes, as there's times it's all too much to recall from the top of my head. :thumbsup: