Quote:
Originally Posted by MARKDTN
Most anybody with a 4L60E or 4L80E. They have a tow/haul mode. I have put a bunch of towing miles on my '01 Tahoe DD. 5.3 and 4L60E. Right at 300K on the truck. Never had any trans work other than a fluid and filter change.
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Usually the tow/haul button adjusts the shift points, convertor lock up, and internal fluid pressures while keeping the OD function working.