Topic: Transmission ID Help
in Forum: C3 Driveline Components
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Hello all....again.....I won't make chat tonight, sorry, have to go to dinner.
ANYWAY.............this is in the LT-1 I just got:
PIT22( C under an X )A
It looks like the "C" was stamped, and then stamped again by an "X"
Thanks!!
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20219
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
P = Muncie HD Alum case 4 speed
1 = 71 model year car
T = December
22 = 22nd day
My guess is the trans was mis-stamped "C", which is the M22("rock crusher") suffix code, they stamped over that with the "X" to "erase" it, then stamped the "A" suffix, which is the wide ratio M20,.
So, the trans is a wide ratio, 2.52 first gear, Muncie M20, built December 22, 1970, for the 1971 model year.
If your car is a '71, and was built after Dec. 22 '70, it's prolly the original.
Here's a little know "tip" on date coding Muncie and BW trannys...
The Year date, for example on this one, is stamped with a "1", but...the trans was built in 1970. What the heck is goin on? Glad ya axed...
The year date codes on these transmissions were stamped for the car model year it was intended for, NOT the year it was actually made/built. So, you can have a trans that appears to have been built AFTER the build date of your car, but it's really not. It's just a weird way they dated them.Just something to watch out for when shopping for a date-coded trans, or...to keep from getting took when buying one that is supposed to be original, or dated for your particular car.
1 = 71 model year car
T = December
22 = 22nd day
My guess is the trans was mis-stamped "C", which is the M22("rock crusher") suffix code, they stamped over that with the "X" to "erase" it, then stamped the "A" suffix, which is the wide ratio M20,.
So, the trans is a wide ratio, 2.52 first gear, Muncie M20, built December 22, 1970, for the 1971 model year.
If your car is a '71, and was built after Dec. 22 '70, it's prolly the original.
Here's a little know "tip" on date coding Muncie and BW trannys...
The Year date, for example on this one, is stamped with a "1", but...the trans was built in 1970. What the heck is goin on? Glad ya axed...
The year date codes on these transmissions were stamped for the car model year it was intended for, NOT the year it was actually made/built. So, you can have a trans that appears to have been built AFTER the build date of your car, but it's really not. It's just a weird way they dated them.Just something to watch out for when shopping for a date-coded trans, or...to keep from getting took when buying one that is supposed to be original, or dated for your particular car.
Joel Adams
C3VR Lifetime Member #56 
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
Cool, thanks Joel. It "feels" much tighter that the M-21 in my '70 L-46, maybe I'll have to crack it open and take a look.
in Forum: C3 Driveline Components
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