Buy a set of FRPP 4.10s for them to throw in. Best $150 you’ll spend on the car. And yes, anydealer will sub the stock 3.31s for Ford 4.10s (or 3.73s if you don’t believe in drag radials).Speak of rear end I got this picture of the parts box the dealer has for my rear end change due to the thumping. Hoping to get my car back soon
-J