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31 Spline (1972) M22 Speedometer Gears Help

Mako

Well-known member
Joined
Oct 31, 2002
Messages
171
Location
Bay Area, CA
Corvette
1969 Hotrod
Heya all, I have a bit of a quandry to solve as to what speedo gears (drive and driven) I need to install in my transmission.

I have a brand new Autogear BOE (best of everything) M22 assembled for my 1969 Vette.

The trick is, it's using the larger 31 spline output shaft, as used in the 1972 gearbox...

Which means the drive gear from my smaller 1969 setup won't work.

The car has 3.70 rear gears and ~26.5" tires (275x40 Firehawk SZ50's).

A chart for the 1972 speedo gear setup would be a Wonderful Thing indeed.... :)

Thanks!
Mako
 

duke94

Well-known member
Joined
Jan 30, 2007
Messages
277
Location
Ann Arbor, MI
Corvette
71' convert and 78' both Red
speedochartV70.jpg


speedpgearsV71.jpg
 

Mako

Well-known member
Joined
Oct 31, 2002
Messages
171
Location
Bay Area, CA
Corvette
1969 Hotrod
VERY helpful, thank you Duke!

Thanks!
Mako
 

mlazinski

Active member
Joined
Jul 8, 2005
Messages
25
Location
Tampa FL
Corvette
1975 Silver Coupe
Duke,
That chart is great! Is there any way you can dig out the page for a 75' 3 speed auto? This is one of many projects I have not tracked down yet, and it would be a great help!
Matt
 

duke94

Well-known member
Joined
Jan 30, 2007
Messages
277
Location
Ann Arbor, MI
Corvette
71' convert and 78' both Red
Duke,
That chart is great! Is there any way you can dig out the page for a 75' 3 speed auto? This is one of many projects I have not tracked down yet, and it would be a great help!
Matt
speedochartV76.jpg
 

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