correct me if I'm wrong, but unless you see the GM docs , you don't know which 4 spd. you have , the trim tag code M20 just denotes that it was a 4 spd.
just what I thought ?? I could very well be wrong??
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later...rog
AADD supporting member !!
I'm a collector...not a builder!!Located in sunny central Saskatchewan at the lakehead!
M20 was the generic RPO for a 4-speed transmission.
For lower performance applications (L6, 307, 327, and L65 350), the Saginaw 4-speed was utilized. It used a cast iron case. For higher performance applications (LM1 350, SS350, big blocks, and Z28) the Muncie 4-speed was used. It used an aluminum case and different gear ratios from the Saginaw 4-speed.
The primary Muncie 4-speed transmission was marketed under RPO M20. The close-ratio version of the Muncie 4-speed was RPO M21 and the heavy-duty close-ratio 4-speed was RPO M22. M21 and M22 transmissions were limited to specific high performance models.
The Camaro 4-speed manual transmissions ratios for both Muncie and Saginaw, with other Muncie data, are as follows:
There were two 3-speed manual transmission options available in the 67-69 Camaros.
The base manual transmission for non-high-performance models and 67-8 SS350's was the Saginaw 3-speed, M15. If no transmission option was selected, this was the tranmission installed. It was column shifted unless a console or RPO M11 floor shift was selected. An exception to this was SS350's, which required the HD 3-speed to get a floor shift.
The heavy-duty 3-speed manual transmission, made by Borg-Warner, was available as RPO M13 for 67-68 SS models. For SS350 models, M13 was optional (but required if you wanted a floor shift). For SS396 models, M13 was a required option if another transmission was not ordered. In 1969, the heavy-duty 3-speed was supplied by Muncie and changed to RPO MC1. It was available on LM1 and SS models. For the LM1, it was a required option if another transmission was not ordered. For 69 SS models, the HD 3-speed trans was included in the SS package.
so, saying all that, M22 would be stamped on the trim tag ?? if say a 68 Beaumont was built as such from the factory?? sure would be great if that was the case...
This debate was discussed about late 70's Camaro's a while back?
__________________
later...rog
AADD supporting member !!
I'm a collector...not a builder!!Located in sunny central Saskatchewan at the lakehead!
