transmission ID

[ibfootin]

I have a 69 Z28 and am trying to ID the transmission and the numbers are not matching what is in the driveline decode section.
Here is the date stamp P0622 and the casting number on the main case is 3885010

[bertfam]

You have a 1966 Muncie assembled on June 22nd.

Ed

[ibfootin]

Thanks Ed

Which numbers mean what
I take it the P is Muncie---and the 6 is June and 22 is the date.  What does the 0 stand for?
Is there a chart for the older muncies?

[bertfam]

That's correct. The P is Muncie passenger car, the 06 is June (they used a two digit format for the month and the day), and the 22 is the 22nd. There are a few on-line sites showing the Muncie codes, but the best is the "Chevrolet by the Numbers" series by Alan Colvin. It has a lot of other info in it as well.

Ed

[ibfootin]

Thanks a gain Ed.  You are a big help.  Can you tell what this transmission is by the numbers I have listed?
M20-M22?

18S421701
P8E29

casting#`s
case 392256660
tail 3857584
side cover 3884685

[bertfam]

Another Muncie (assembled on May 29th, 1968 for a 1968 Corvette assembled at the St. Louis, MO plant), but you need to look at the number of rings on the input shaft to know exactly which one.

No rings - M22
1 ring - M21
2 rings - M20

Ed

[Racerdan]

Here is the decoding of the one I have in our Vintage Camaro Racer.  It is not original, but it is a rock crusher.  Not only does tyhe shaft have no rings, but the case numbers show it to be one as well.  See below:

Casting numbers- patent # 3088336 (‘64 and up Muncie), 3925660 (68/69 Muncie 4 speed), cone # 3857584GM= 1966-1970 passenger car, 27 spline output shaft).
Stamped numbers: P9011C=
P= Muncie 4 sp
9= model year
D= April
11= 11th day
C= rock crusher M-22, 10 tooth input, 27 tooth output shaft.
 Vin# 19N650376   1= Chevrolet, 9=1969 model year, N=Norwood, Ohio plant, sequence # 650376.
There was a total of only 4253 M-22 made in all 1969 GM models, of which only 2117 were Camaro, and 101 were Corvette.

[ibfootin]

Thanks guys