I was having the same problem with my savage and the hd drive gear solved the problem. The stock gear is unhardened steel. The hd gear is hardened steel and will last longer than the rest of the truck.
They say a good mechanic only needs 2 tools - WD40 & Duct tape. If it moves, and its not supposed to, duct tape. If it doesn't move, and its supposed to, WD40.