Layshaft up-grade

[JimCT]

We broke the layshaft in our '68 military gearbox a few years back, replaced it with a spare form our parts car, but it is time to rebuild the military box. Am I right to understand that it is possible to use a newer and better layshaft and appropriate gears to strengthen it a bit? So if so, who know the part numbers I will need? thanks Jim

[I Leak Oil]

Go with the suffix D and up parts. Suffix C is not bad either. If your truck still has the '68 box then chances are you have one of these to start with. The higher the suffix you go the better.
Jason T.