I am not sure about the chip, but I did have to replace the carrier bearings in my rear end. They were making a roaring noise. While they had the diff apart, I had them install some 3.73s. If you are not hearing a roaring noise from the rear of your car, you bearings may be ok. The ones that came out of mine were pitted pretty bad.
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'97 Cobra, Rio Red, MAC Cold Air Kit, 3.73s, NGK V-Power
BBK H-pipe w/cats (Coming Soon!!)
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