1970 GS Stage One with 3.64 rear. I need to know the correct speedometer drive gear and driven gear. I have the M21. I also need to know if this setup requires the adapter. Where can I get these parts?
Speedo gears are available from GM. You can calculate which driven gear you need very easily, but you need to know how many teeth on the speedometer drive gear(on the output shaft) already installed in the transmission. Should be easy enough to look inside the sleeve hole, rotate the trans and count the teeth. Also need your rear tire size.
