I pulled the driveshaft off today and redid the u-joints & rear trans seal on my '72 camino today and while I was under there I pulled some numbers off the trans (two birds one stone
)
it's a manual 4 speed
it says GM 3925658
then it has an NF but the F is attached to the right leg of the N
that is followed by a small o and a larger 2 ---All this is on the passenger side
sorry if thats a little confusing just trying to describe it as accurately as possible
thanks in advance