I need help does the 2006 ERC060 have issues with the differentials. I have a customer that sunk a boat load of cash in a bunch of them and I have been asked whats going on.

Not having done the work I can't be sure but I am old enough, to be smart enough, to ask for help. If it helps the trucks have Quads and a fork positioner attachment on the front (more weight?). Some one told me he believed that this was a relatively new drive axle for Yale in 2006, can't be sure if he knew what he talking about.

Any help from the Yale/Hyster brotherhood or experienced Independents is much appreciated!