31 Spline (1972) M22 Speedometer Gears Help

[Mako]

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]

 

[Mako]

VERY helpful, thank you Duke!

Thanks!
Mako

 

[mlazinski]

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]

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

 

[mlazinski]

Thanks, greatly appreciated. My speed will be right again!