On 2816 i found that the splines on the back of the hub would bottom out before the proper torque was applied to the bearings. we machined out about .040 of the splins in the back of the hub so that the assembly would tighten up correctly. without doing this the bearings never received the right preload and would start to separate and loosen up in the housing.
In the picture you can see the counter bore. Once we did this not any more wheel bearing problems.
