Neu 1512 vs. 1515

AAngel, that was exactly the problem. on my lsp, with mike's motor mount, a 16t pinion is the smallest that will work with a 44t diff gear i was using. I replaced the 44t with a 46t, because the 44t just barely reached, and got stripped. 14/46 might have worked, but wouldn't run nearly as cool as the 1515 2.5d is now.