i'm having a lot of problems with the 3 on the tree tranny jumping out of 2nd gear. it will not stay in gear with out holding it and then it still wants to jump out. acts like something hits it and it jumps out. i'm driving it everyday know and need to do so as my other truck is being worked on.
i want to install a 4 speed tranny in it. will a 1950 4 speed fit it. it is still has the closed driveshaft.

i've tried adjust the linkage but not helping. i can't put install an open drivshaft rear end in it till this summer so have to deal with this right know. ive located a 4 speed from a 1950 1/2 for a cheap price. what do i need to do. thanks