ot, but farm truck

ericlb · Apr 22, 2014

im trying to replace the 1-2 shift fork on a ms 420 transmission in a '57 chevy 4400 truck, the manuel stated that to remove the fork i have to first remove the reverse shifter head by driving out its pin, now heres the problem, the pin is obviously driven in from the 'top' [ this is with the top cover of the transmission upside down on the bench with the shift stick removed,] the shift rails are in nutural, and i can see no way to get to the bottom of the pin to drive it up, the pin is slightly mushroomed on the top, and if it was driven down, i dont think there is enough room to clear the top cover housing, what do i need to do here to get the pin out so i can remove the shift rail, the reverse shifter head, and then i can get the pin out of the 1-2 shift fork?

Dr. Walt · Apr 23, 2014

Here's what I've done in similar situations. First, clamp the Trans cover in a vise, because you're going to need both hands to do the following. Take a short, smaller diameter pin (I've used hardened needles from an old needle bearing) and using a pair of angled tweezers put the short pin against the bottom of the pin you want to remove. Next, using a small Heel-bar, pry upward against the small pin with enough force to move the first pin upward. You don't need to push the first pin very far, just far enough to get a pair of locking Vise-grips on the pin and pull it out with a twisting motion.

I've used this technique several times, it also works on pins that have sheared.

Doc

ot, but farm truck

ericlb

Well-known Member

Dr. Walt

Well-known Member

Similar threads