how to ID a main shaft ???

[Pantera]

I found a 21 tooth inpuitshaft for a fourspeed (I hope) at the fleamarket this morning. It is in great shape with no ground-on syncro miss shifts. it has two ring groves on the clutch splines. I presume it is a Muncie wide ratio input shaft?

Does this sound like I am close??? I got it for a $1, so I know it has to be a bargan if that is what it fits. I can see no part #'s on it anywhere. That was all the little ole lady had. She had no idea what it was except it was a "car part".

I just love flea markets. You just never know what somebody will show up with and for cheap too.

Pantera