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so just split open my carrier looks like I have the three pin set up what's the difference between the four pin setup other than the number I bought a locker before I knew what I had mine is three the locker is four !
You have the factory Gov-lock differential if it has 3 pins. If the locker you bought is a Detroit locker it cannot be installed into the 3 pin Gov-lock differential. You will need to buy a factory open differential to replace the Gov-lock and then install the Detroit. Gear ratio does not matter for the Detroit. If the "locker" you bought is something other than a Detroit than the above doesn't apply.
You have the factory Gov-lock differential if it has 3 pins. If the locker you bought is a Detroit locker it cannot be installed into the 3 pin Gov-lock differential. You will need to buy a factory open differential to replace the Gov-lock and then install the Detroit. Gear ratio does not matter for the Detroit. If the "locker" you bought is something other than a Detroit than the above doesn't apply.