Gears are really strong it's hard to mess up gears its the other parts that get beat up posi clutches and shit like that .. Yes I've seen people break spider gears but it's not nearly as common as blowing some posi clutches so the car only does doughnuts to the left . When I install gears in customer cars I ask them can you do doughnuts both ways ? If the answers no then they usually always pay extra for some clutches . There cheap anywyas But on a low milage car I'd assume they'd be fine Cus that car looks clean