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#1
06-26-2008, 01:56 PM
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Muncie Tranny Question
OK. I got my new rear axle housing installed with the new gears and carrier unit. Everything runs well. I did change the gears from 3.43 to 4.11s and now the speedo is correct at all speeds. Where as before it was off anywhere from 5 - 15mph. Question: wouldn't it make sense that if a Muncie 4-speed had a 4.11 speedo gear installed, (for the speedometer) that it would be a close-ratio 4-speed? I have yet to figure out if the tranny is a M20, M21 or M22. It does have a wine when I drive it but I have never heard a "true" M22 to compare it to. It almost sounds like a small blower when I am driving it...
Thanks - Rob
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Rob M. '68 L-72 Biscayne, M22 4-speed 
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#3
06-26-2008, 03:18 PM
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Re: Muncie Tranny Question
No it doesn't. My car is a '68 and I believe they started putting letter designations on Muncie's in Oct. '68 for the '69 model year.
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Rob M. '68 L-72 Biscayne, M22 4-speed
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#4
06-26-2008, 04:18 PM
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Re: Muncie Tranny Question
how many grooves on the input shaft? In general...
2 - m20 1 - m21 0 - m22
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I don't think it was coincidence that the Great Depression happened during Prohibition... 
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#5
06-26-2008, 04:31 PM
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Re: Muncie Tranny Question
Can I see the input shaft without taking the transmission out of the car? Or the clutch?
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Rob M. '68 L-72 Biscayne, M22 4-speed
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#6
06-26-2008, 07:14 PM
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Re: Muncie Tranny Question
Check and see if the trans has 2 pipe plugs in the case... one for fill and one lower to drain the case... if so it is a M22 case... no guarantee the straight cut gears are still in the trans, but the chances are better than not!
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~JAG~ NCRS#65120 68 GTO HO 4 spd Alpine Blue /Parchment 2 owner car #21783 71 Corvette LT1 45k miles Orig paint - Brandshatch Green - National Top Flight - last known 71 LT1 built. 71 Corvette LT1 42k miles Original paint - Black - black leather - only black LT1 known to exist. NUMEROUS Lemans blue Camaros, Monza Red and Daytona Yellow Corvettes & a Chevelle or two... Survivors, restored cars, & other photos https://picasaweb.google.com/lh/myphotos
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#7
07-12-2008, 05:03 AM
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Re: Muncie Tranny Question
I don't know about '68s but our COPO Chevelle had the 4.10 gears and and M20 Muncie.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now. 
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