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Topic: Which transmission was in the car orginally

in Forum: C3 Driveline Components


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Which transmission was in the car orginally

Posted: 2/7/08 12:56pm Message 1 of 4
Fairlane514
Former Member
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Houston, TX - USA
Joined: 2/7/2008
Posts: 93
Vette(s): 1970 454 4 speed A/C power everything else
I just bought a 70 Big block coupe with A/C 4 speed and power everything else. I dont have the car in front of me so I can t look at the build sheet.
The transmission is missing and I'm trying to figure out if it was a M20 or M21, 10 or 26 spline on the input shaft etc
I also dont know the rear end gear.
As far as I can tell there aren't any special performance packages on this car.

Thanks!


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Which transmission was in the car orginally

Posted: 2/7/08 1:12pm Message 2 of 4
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apasbigal
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goldens bridge, NY - USA
Joined: 11/3/2003
Posts: 498
Vette(s): 1972 T-Top 350 auto, matching numbers,Blue, ac
Probably a M21 close ratio - 4383 units were sold in 1970 - only 25 - M22 (heavy duty close ratios) were sold - but hey -you never know -
Look in tools tab above - then vette statistics - this may help some
Standard rear axle ratio 3.36:1
Optional rear axle ratio 2.73:1, 3.08:1, 3.36:1, 3.55:1, 4.11:1, 4.56:1
Big Al
 
Also try :http://www.vettefacts.com/
 
M1970 m21- 10 spline
1970 m22-26 spline
  
apasbigal2008-02-07 14:08:37



Which transmission was in the car orginally

Posted: 2/7/08 5:53pm Message 3 of 4
ossw1
Former Member
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Rocklin, CA - USA
Joined: 4/2/2005
Posts: 484
Vette(s): 1970 T-Top350/350hp numbers matching 4 speed. It's a mess and 1970 Convertible 4 speed.
Look under the rear in end and get the numbers to see what it was. My 70 is a 3.08Cry


Which transmission was in the car orginally

Posted: 2/7/08 8:33pm Message 4 of 4
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Adams' Apple
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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
The M22 "Rock Crusher" was only available with the LT1 w/ZR1 package...
Depending on if it has A/C or not, the rear ratios would be:
M20(wide ratio) w/out A/C could have had 3.36(std) 3.08(opt) 3.55, or 3.70

M21(close ratio) w/out A/C could have 3.08, or 3.36

M20(wide ratio) was not available with A/C so...
M21 w/A/C could have only the 3.08

Now ya know!


Joel Adams
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

in Forum: C3 Driveline Components


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