My question is i had my rear changed from a 1 legger to a posi my rpm at 70 mph is about 2800 to 2900rpm is that normal my rpm at 70mph before was at 2500rpm my 1 legger was 3:73 and the new one is 3:73 posi from what i was told can the change of 1 rear end to another rear end change my rpm or do you think i might have a higher gear ratio.