If you have 2.73's (RPO GU2) you have a 2 series carrier and normal 3.73 gears WILL NOT
If you have 3.23's (RPO GU5) then you have a 3 series carrier and normal 3.73 gears WILL
If you have a manual you have 3.42's and the 3.73's are fine.
If your car comes with 2.73 gears and the 2 series carrier you must order "Thick cut" 3.73 gears specifically made for 2 series carriers. I know www.ws6store.com