So before I get into the issue, yes i have been searching and found a lot of information just not on my specific problem. I am well aware of the generation 2 issues with the gearboxes. However my gear box is not "broken" nor are the gears stripped. My issue comes from the motor running and the gears not engaging. Now I did open up and find ou the issue. My back driver wheels keep fall off the axles ever so slightly even on the rails and the gears can no longer engage each other. Does anyone have a proper fix for this issue or has dealt with this specific issue or should I just try to swap onto a Generation 5 chassis?

Manythanksin advance.