Discussion in 'U-shift em' started by Jrcarz, Jul 7, 2015.
M-21 or m-22 i believe. Mine has the fine spline input shaft and had a posi. Been told its a m-21
not an M22 but an M21. think the M22 was chevrolet only.
My 71 350 4 speed is a 3.08:1 posi and M21 close ratio. It has the large tail shaft/drive shaft yoke.
Both my 72s came with m21 26-32 big tail. I think the 455 was the sameo No: