M-22 ???

[Hotrodpaul]

Some aftermarket input shafts do not have grooves to denote M20 or M21 ratio's. It may not be an original GM input shaft.

Paul
69 Camaro SS 396 L78

[Zman]

Like I said....Count the Teeth on the input GEAR, not the splines on the shaft. M-20 = 21. M-21/22 = 26.
The exception is the very early M-20 with 24 teeth.

[Mr70]

Fred
Checkout Charleys M-22 pictures he's selling in the Parts for sale section.

[JoeG]

[ QUOTE ]
looks like M21/M20 gear cut.

[/ QUOTE ]

Looks like---

Is there a production #? A=M20,B=M21 -----ex. like on Charley's M22

[JoeG]

Or do like Zman said count the teeth on the input gear---

Thanks for the photo of that tag Darren