I have finally gotten around to working on a barn find series 3 that I've had for a while. When purchased (P.O. expired) the top cover was loosely fitted to the gearbox and a few springs and detent balls were missing. I got those replaced, repositioned the slector shafts and still have no 3 or 4th gear. Is this a syncro issue, selector shaft adjustment or what? The slector shaft seems to travel the appropriate distance and 3rd seems to try to engage with a little grum
bling. Fourth doesn't even try. Pops out of second on over-run. 46K on the truck.