69 Muncie M-21 Part #

[Wes G.]

Can anyone provide me with the GM part # for my 69 Corvette 4 speed Muncie M21 (435 hp)transmission? Somehow, that section is missing from my '53 to 82 Corvette Parts & Illustration Catalog'. I would like to have 'Long Island Corvette' make a Muncie Transmission Tag, however I must provide them with the number as they specialize in 63-67 Corvettes.
Thanks
Wes NCRS # 33239

[Mark #28455]

what was your differential gear ratio? *NM*

[Mark #28455]

don't have my assembly manual

But the 1973 version of the parts book lists:

3950318 - 1969 M22
3968012 - 1969 M22 (exc. P/Trac) Huh?

3946798 - 1969 (close ratio w/Sp. H/Per) (427) (Exc. P/Trac.)
3950316 - 1969 (close ratio w/P/Trac.) w/Sp. H/Per. (427)

Hope this helps,
Mark

[John H.]

Re: don't have my assembly manual

I think the confusion in the parts book over "P/Trac" stems from the fact that the high (numerical) axle ratios (which require a different speedo DRIVE gear on the output shaft, thus a unique transmission assembly part number) were released as ECL's under RPO G81, which was the Positraction option code. The notations don't really mean with/without Positraction - they mean with/without extreme rear axle ratios.