Wrong, check your facts!
To quote a NCRS parts expert..
"Actually, what you have here is a "Muncie" transmission, but it's not what we all think of as a Muncie. For 1978 and 1979 Corvettes with L-48 used a 4 speed transmission that was very similar to the Saginaw 4 speed of the late 60s-early 70s. Production of this transmission was transferred to Muncie, IN and the unit became known as a "Muncie".
Please steer me to that NCRS expert. I've never heard that before.
Here is my expert:
John Z
Date of Birth:
February 27th, 1941
Age:
65
Nickname:
John
Location:
Washington, Michigan
Occupation:
Retired Viper Plant Manager
Interests:
Corvette/Camaro/Ferrari; Technical Editor, "Corvette Enthusiast" magazine, Chairman, NCRS Michigan Chapter, NCRS Master Judge.
Biography:
37 years in Engineering and Manufacturing with GM and Chrysler; worked for Zora in the Corvette Group in '67-'68. Have done six body-offs in the last 30 years, and built a tube-frame Grand Sport. Now retired, in my 2500 sq. ft. dream garage!
Corvette:
'67 Marina Blue Convertible
Corvette Club:
Chairman, NCRS Michigan Chapter; member, GMC Corvette Set
NCRS Member?:
Yes
And he says :
"From '62 to '65, the engine option determined whether you got a wide-ratio (M20) or close-ratio (M21) gearset - it wasn't a customer choice, and the M21 option code which provided that choice didn't appear until 1966. All 4-speeds prior to '62 had close-ratio gearsets.
All Corvette 4-speeds from 1975-1981 were Warner Super T-10's."
Thanks,