[Anthony]

Ed, a lot of good info !!

Yes, I know racers would take stock gears, and grind off every other synchro tooth, to enhance power shifting, strictly a racing modification, not for street, as the picture of your liberty gear showed.

GM modified the M21 close ratio gears, decreasing the tooth angle, which strengthened the teeth, I guess mainly for drag racing, and named the tranny M22, still using the same ratio's as M21.

Also, the higher the gear multiplication, the less torque the tranny can handle, so keeping all other things equal, a M21 (2.2:1) should be stronger than a M20 (2.56:1)

Chrysler had Borg Warner design a new tranny for the Viper's introduction, which was the T56.

Using the Muncie and Toploader as benchmarks, I think all current street 5 and 6 speeds are basically wide ratio 4 speeds with 1 or 2 overdrives. I can only think of one true street close ratio 5 speed, and that was the old Doug Nash / old Richmond Gear 5 speed, where 5th gear was 1:1, and all the gear spreads were truly close ratio.