Where to get 3.55's
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I would reccomend having them installed as the tolerances for backlash between the gears is very strict. If you have them installed I would price the full installation and parts at a local shop. Shops like to use thier own parts because they can make the mark up and know that the parts that they are using are correct. Also, if you purchase the parts the installer may not give any guarantees. I would ask around and check a smaller local shop that have been around for a long time. Some transmission shops service differentials.