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    My Vehicles

    1980 Chevrolet Truck G20 3/4 ton Van 5.7L 4BL OHV 8cyl

    My Store

    405 N COLLEGE ST
    (479) 443-4043

    OPEN 'til 10:00 PM today

    SAVE 20% ON ONLINE SHIP-TO-HOME ORDERS OF $100 OR MORE.

    Use Code: SEECLEAR

    See Details

    Companion Flange

    Inspect/Replace

    • The driveshaft connects to the differential either using a companion flange or a pinion yoke.
    • Check for obvious damage, bends, and missing weights. Weight will either be on the front of a flange or the outside depending on whether the correction was for flange runout or differential balance.
    When there is a weight on a pinion flange, it was put there to correct for runout.
    • Runout on the flange is checked with a dial indicator. It is limited to 0.0006” when there is no weight on the flange.
    • A hardened pinion seal can wear a groove in the mating surface of the companion flange or pinion yoke. the flange will need to be removed and visually inspected. if a wear groove exists, there may be a repair sleeve available to avoid the cost of replacing the part. replace the pinion seal.
    Look for a wear groove caused by a hardened pinion seal rubbing against the pinion yoke (top) or companion flange (bottom).

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