I have a 68 with a 383 and a 350 turbo tranny with a 342 posi rear end and I was thinking of changing it over to a 4-speed and I would like to know witch yokes are the same as the 350 turbo ,the m_20,the M_21 ,or the M_22 any help would be appreciated ,,,Thanks ,,Camaro BOB

Bob, I believe all those yokes share the same spline yoke, even the exten housing seal will be the same.

As long as you stay with the early small shaft trans they are the same.