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  1. J

    Swapping front diff help

    98 Yukon 4x4 auto. Front diff grinds loudly in 4. Swapped fluid for fun, no change. Bought a front diff off marketplace. Told him the GT4 RPO code and that it’s 4x4 auto buttons. Got to looking at it (new to me diff) and it’s got two plugs. One to the actuator itself. And one to the...
  2. J

    Extensive Tune Up Misfires

    This sounds a lot like the threads I’ve been reading but I’m lost and defeated… 98 Yukon 5.7 vortec 200,000 miles p0300 and rough misfire under load or on hills at highway speed. Won’t accelerate past 2000rpm when it starts happening. Makes living in the mountains tough parts replaced in...
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