I was hauling some feritlizer today on the 5th wheel trailer and on my first load on the highway after getting up to speed and running in 5th for about a mile I heard a snap come from the transmission and the transmission seemed to jolt. The snap sound occured about another 100 yards again so I shifted down to 4th for the rest of the 10 mile trip with no problems. On my way back to get another load whenever I seemed to get up around 55 I would maybe get that snap again. This happened about twice on my way back to get another load. Every load I hauled I stayed in 4th when loaded and never had any problems. But every time I was empty I went to 5th and the thing would snap every once in a while. Any Ideas on whats going on. I don't think it has anything to do with the clutch since It pulled good in all other gears up steep grades. The transmission only has about 4000 miles on it and I'm not sure if it has the 5th gear nut update or not so I'll be calling tommorw to see if the place I bought it from had made the fix.
Matt
Matt