Well I'm not sure if I'll need the 510 diff rebuilt, I know it's leaking, if it's OK I will use it. But if I get a zx donor car ,I'll have the zx diff on hand.The 510 isn't drivable, so I don't know if it's bad. Anyone know if parts are available to rebuild one, or if it can be rebuilt for under say,$400.? Bought the car not running, so don't know if the diff is gonna be noisy or messed up.