I have this muncie M-21 with I belive a 67 cast and stamp but would it be for 68? maybe some gurus can post some info.

7 L 113736 (on top of case and stamped on another area)

one ring inputshaft - M-21

P7R20 stamp code - October 20,1967

Main case #3885010

Tailshaft #3857584

Side Cover #3884685

My question is with the October stamp date would it be for 1968? or a late 67 .

My research says "L" is Oldsmoblie with M-21 would be 442 cutlass with 411 gears or perhaps a W-30 Hurst olds with 4:33 gears VIN ending in 113736....

This Trans came in a 65SS 4speed nova a buddy bought years ago now in CA , He now has correct Muncie for his car this one removed and just sitting for ten years.
there is a Hurst shifter attached to it Flat stock handle and the shifter says Hurst. Thanks for any input I want as much correct information before I advertise it in classifieds.

Thanks in advance Joe

 

Where are you located?
I could use it, if the price is right!

 

I am in California South of San francisco. So I assume you have a 68 ?.


Its got to go ....best to PM me I guess ....Joe

 

Done!

 

That is not an Olds trans.
You are correct that is an October '67 trans, and that would be for the '68 model year. That also means it has the VIN derivative stamped on it which is what you see "7 L 113736", I believe. If it were an Olds trans it would have "38 M 113736" or another letter. The "3" is for Olds Div., the "8" is for 1968 model year, the letter M would be Lansing plant or whatever plant code (must be M,Z,G, or E), and the last 6 numbers are the last 6 numbers of the original VIN.

 

The trans was built Oct. 20th 1966 for use in early 1967 model year cars...

3885010 main case was used 1966-67 model years only...

"L" is Van Nuys, Ca. assembly plant... In 1967 they built F-bodys there...

Hope this helps... Crash

 

I don't understand how you got 66 from info I posted?

 

Thanks for posting this information I printed a ton of paperwork on the muncies I could swear I saw "L" as Olds I'll look again that is why I am here asking before I sell trans ,I'll look up more info....thanks Joe

 

Joe, You have to remember Muncie 4-speeds are dated for the model year, not the callender year...

What model year car were on the assembly line in Oct. 1966???

1967 model cars right, that why the "P" number is P7R20...

P=====Muncie
7=====1967 model year
R=====October
20====20th day

So the only Oct. in the 1967 model year is, Oct 1966...

Hope this helps... Crash

 

Thanks now I understand !

 

I believe that is *not* true. I have multiple sources that concur that only December built Muncies carry the model year code. All other months have calendar year date codes!
And as further evidence, a '67 model year trans would not have a VIN derivative stamp,as that started with '68 model year.
So this transmission is date coded for Oct 1967 for a 1968 model.

 

Thank you its clear now !

 

VIN derivative stamps on aluminum 4-speeds in Chevys started in 1963...

In the NCRS 1953-72 spec guide the VIN for the last car produced of every month is recorded, with this information you can track early model year cars, and see that Muncies built and dated P7R20 indeed were built Oct of 1966 for use in a 1967 model year car...

The "L" in the VIN stands for Van Nuys Ca. where Camaros are built...

The "7" in front of the "L" is the model year...

The 3885010 main case was used 1966-67 only...

I know Olds didn't use VIN's on drive trains until 1968, but this trans is NOT from an Olds...

I hope this clears up any questions you have...

If not, I have over 100 Muncie cores in stock, and more than 200 main cases to choose from to prove my point...

Crash

 

Thanks for the explanation Crash, I'll look into it further. You'd think that the sites that cover Muncie Trans would get it right.
What's the "break/cusp" month for the year? June?
Please email me at wmachine@shubes.net , I'd like to establlsh the surce for the correct material and ask you about some housings.

 

Looking at the numbers I've recorded over the years one this stands out for me. there were alot of mistakes made.

The 66 KC plant only built Chevelles and El Caminos. OK do any of these numbers make sense to anyone?

the 67 Lordstown Ohio plant built full size Chevrolet's. They built more cars on the 26th of April then they did on the 27th?

The 68 KC plant look good except I question if thy really built 33180 cars from Feb 15th to March 25. Take note how the vin number dropped in August.

Now there are not enough numbers here to verify which numbers are right and which are wrong but it gives one a overview of at least what
your up against when trying to decifer such info.

Note the numbers for the 1966 K plant- KANSAS CITY ( Chevelle and El Camino)

1966P0215FEBRUARY 125H, 19666K159744
1966P0302MARCH 2ND, 19666K1250001966P0302MARCH 2ND, 19666K1249391966P0310MARCH 10TH, 19666K1258111966P0609JUNE 9TH, 19666K2037791966P01007OCTOBER 7TH,19656K1272101966P1119NOVEMBER 19TH, 19656K126569
1967 U PLANT - LORDSTOWN OHIO WHICH BUILD FULL SIZE CHEVROLETS



1967P7C07MARCH 7TH, 19677U1366081967P7D26APRIL 26TH, 19677U1424811967P7D27APRIL 27TH, 19677U139192
1668 K PLANT CARS- KANSAS CITY- CHEVELLE AND EL CAMINO



1968P8B15FEBRUARY 15TH, 196818K159541
1968P8C25MARCH 25TH, 196818K1927211968P8E10MAY 10TH, 196818K2143381968P8E14MAY 14TH, 196818B2174141968P8E20MAY 20TH, 196818K2176341968P8H24JUNE 24TH,196818K2376271968P8H25JUNE 25TH,196818K2367011968P8M22AUGUST 22ND, 196718K109462