Sounds like a valve body problem to me, I have experienced a similar though not the same issue with a th350 towing a 7000lb camper down a steep grade in Shenandoah valley VA. I changed out the valve body and put a HD shift kit in it and problem solved, to this day that 79c10 is on the road with...
My front and rear truetracs will be installed hopefully by Wednesday If I don't have any issues. My only issue is that if I happen to get one wheel off the ground will the use of the e-brake/ brake pedal modulation get the torque transfered to the other one like everyone says?
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