95 75hp oG086583 3 jaw reverse. The forward and reverse gear had a lot of wear on the jaws so I had them rebuilt. The owner (friend) was having the reverse gear slip when in R, so he tightened up the shift linkage, after I got the L/U rebuilt, you can manually change the gear on the L/U from F/N/R, turn the drive shaft and the prop responds properly. When I went to re-install the L/U, I can't seem to get it to take reverse from the shift linkage. I put the linkage in F, the L/U in F then slide it in, mating up the drive and shift shafts. Each time I bolt it up then use the slide rail to try to change the gears it will go to F & N all the way to the rear, it will not engage R. Is there a trick here I'm missing?