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  1. #41
    Join Date
    Sep 2014
    Marysville, WA
    Country Flag: United States


    Interesting about the GM fluid. I have been using the Royal Purple brand, but I definitely get the cold groan too.

    BTW, been running the P/S low pressure side through my radiator's auto transmission cooler. I need to get a temp reading like seen above to check its effectiveness.
    67 Ford Galaxie
    5.0 coyote engine, 4R70W, 9" truetrac
    68 Camaro RS vert
    LS3/T56 magnum, 9 inch, Ridetech F/R, Baer brakes
    89 Jeep Grand Wagoneer
    LS 5.3, 4l60E. Wife's daily.

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