1970 M22 Muncie Anyway to tell what car it is from?

[Mike G.]

Re: 1970 M22 Muncie Anyway to tell what car it is from?

Hi: I have a 1970 M22 Munice transmission. Is there a way to find out what kind of car this came out of ?

Dave

the only 70 corvettes that had the m22 was the zr1.

[David R.]

Re: 1970 M22 Muncie Anyway to tell what car it is from?

OK I got the numbers, POB16C, case casting number 3925661, tailhousing number 3978764 with EEE hand stamped. No serial or service unit code, it does have a drain plug. I guess it's a over the counter part.

Dave

[Joe L.]

Re: 1970 M22 Muncie Anyway to tell what car it is from?

OK I got the numbers, POB16C, case casting number 3925661, tailhousing number 3978764 with EEE hand stamped. No serial or service unit code, it does have a drain plug. I guess it's a over the counter part.

Dave

David-----


What you have is a 1970 model year Muncie M-22 which was manufactured on February, 16. It is a SERVICE transmission and its application was 1970 Chevelle. How do we know the intended application? For the 1970 model year, the Chevelle was the only M-22 which used the 3978764 extension housing.

Is there a metal tag with an embossed GM part number attached to one of the side cover bolts?

[Erik S.]

Re: 1970 M22 Muncie Anyway to tell what car it is from?

Is there a metal tag with an embossed GM part number attached to one of the side cover bolts?

Joe - what would that tell us (other than some numbers), I mean the fact there is a metal tag? Is that service only or ...?

[Joe L.]

Re: 1970 M22 Muncie Anyway to tell what car it is from?

Joe - what would that tell us (other than some numbers), I mean the fact there is a metal tag? Is that service only or ...?

Eric-----


The metal tags with part numbers were usually on both PRODUCTION and SERVICE transmissions. However, they don't always remain there. When folks remove the side cover, they often neglect to re-install the tag.

The part number on the tag would confirm the exact, intended application(s) of the transmission.

[David R.]

Re: 1970 M22 Muncie Anyway to tell what car it is from?

Thanks Joe: The metal tag is long gone.

Dave

[Tom P.]

Re: 1970 M22 Muncie Anyway to tell what car it is from?

David-----


What you have is a 1970 model year Muncie M-22 which was manufactured on February, 16. It is a SERVICE transmission and its application was 1970 Chevelle. How do we know the intended application? For the 1970 model year, the Chevelle was the only M-22 which used the 3978764 extension housing.

Is there a metal tag with an embossed GM part number attached to one of the side cover bolts?

Joe,
Did the 70 Camaros/Novas not also use the 3978764 tail housing if they got an M22 behind an L78???

[Joe L.]

Re: 1970 M22 Muncie Anyway to tell what car it is from?

Joe,
Did the 70 Camaros/Novas not also use the 3978764 tail housing if they got an M22 behind an L78???

Tom-----


As far as what GM says for the 1970 model year, only Chevelles with M-22 used the 3978764 extension housing. For 1970 Chevelles, I believe that only L-78 or LS-6 could be equipped with M-22.

[Steven B.]

Re: 1970 M22 Muncie Anyway to tell what car it is from?

Dave-----


If the plant made more than one model, you can't tell which model from the VIN derivative stamped on the transmission. However, I think that the first character of the VIN derivative might have identified the car line (e.g. 1= Chevrolet) as some plants manufactured more than one car line. Otherwise, one might be able to narrow down the model in which it was originally installed by the VIN sequence number.

As a matter of fact, St. Louis was a perfect example. St. Louis was once the largest assembly complex in the entire GM system. The "S" plant identifier was used in the VIN regardless of whether the car was a Corvette or an Impala. So, as far as I know, it would be possible to have a transmission VIN stamping exactly the same for a Corvette or an Impala of the same serial number sequence. However, there were a lot more Impalas made than Corvettes, so if the VIN serial number sequence was higher than the total number of Corvettes made that year, then the transmission had to be out of an Impala (or, some other model made at St. Louis).

The whole issue is quite academic, though. There was no difference between a Muncie installed in a Corvette and those used for most other GM cars using a Muncie. So, what real difference does it make what car the transmission was actually originally installed in?

Joe, was the same true for Saginaw and BW boxes?

Thanks!

Steve

[Joe L.]

Re: 1970 M22 Muncie Anyway to tell what car it is from?

Joe, was the same true for Saginaw and BW boxes?

Thanks!

Steve

Steve-----


As far as I know, the same thing was true for Saginaw and Muncie 4 speeds.

[Steven B.]

Re: 1970 M22 Muncie Anyway to tell what car it is from?

Steve-----


As far as I know, the same thing was true for Saginaw and Muncie 4 speeds.

Thanks Joe!!! 'Much appreciated!

Steve

[Tom P.]

Re: 1970 M22 Muncie Anyway to tell what car it is from?

Joe,
That may be true, I don't know for sure. But I DO KNOW that M-22s were available in the 70 Camaros/Novas (but how many were delivered with M-22s, I don't know). So, if ONLY the Chevelles got the 764 tail housings on M-22s (for 70), that means all the other cars with M-22s (Vettes-Camaros-Novas) had the smaller, 27 spline tail shaft and the 584 tail housing-----------------except maybe 70 Ponts, such as the GTO. If the 70 Ponts even got an M22, then did they get the 27 or 32 spline tail shaft version? If they got the 27 spline tail shaft, then they got the 429 tail housing, because for some reason Ponts stayed with the driver side speedo gear until about 70. For example, was the 70 455 Judge available with an M22? Or how about a 70 W-30?

[Joe L.]

Re: 1970 M22 Muncie Anyway to tell what car it is from?

Joe,
That may be true, I don't know for sure. But I DO KNOW that M-22s were available in the 70 Camaros/Novas (but how many were delivered with M-22s, I don't know). So, if ONLY the Chevelles got the 764 tail housings on M-22s (for 70), that means all the other cars with M-22s (Vettes-Camaros-Novas) had the smaller, 27 spline tail shaft and the 584 tail housing-----------------except maybe 70 Ponts, such as the GTO. If the 70 Ponts even got an M22, then did they get the 27 or 32 spline tail shaft version? If they got the 27 spline tail shaft, then they got the 429 tail housing, because for some reason Ponts stayed with the driver side speedo gear until about 70. For example, was the 70 455 Judge available with an M22? Or how about a 70 W-30?

Tom------


There were only 600 1970 Camaros with L-78. However, GM says they all used the 3857584 extension housing (the '429' housing was not used after 1965).

There definitely were quite a few 1970 Camaros built with M-22 transmissions------1,185 to be exact. Mostly, I think that these were likely Z-28's as Z-28's were available with the M-22 option. In any event, they were either Z-28's or Camaro SS with L-78.

I have a friend that's the original owner of a 1970 Z-28 with M-22 which he factory-ordered. The car only has 181 miles on it as he only drove it the first day and then never again. His car has the '584' extension housing.

As far as other GM cars using Muncies for 1970, I don't know what extension housing was used.

[Tom P.]

Re: 1970 M22 Muncie Anyway to tell what car it is from?

Joe,
The late 60s Ponts, such as the GTO, did in fact use the 429 tail housing-----------------I THINK through 70.

[Joe L.]

Re: 1970 M22 Muncie Anyway to tell what car it is from?

Joe,
The late 60s Ponts, such as the GTO, did in fact use the 429 tail housing-----------------I THINK through 70.

Tom------


Like I say, I don't know much about other GM cars of the period. However, as far as Chevrolet goes, I believe the last use of the '429' extension housing was mid model year 1965.