Originally Posted by
Fast355
Get a copy of blue cats and remap the shift points.
For tow haul I set the preference to lock the torque converter in acceleration from 2-4th gear. Do that by setting acceleration lock to 2nd gear in blue cats. With a 4L60E I leave the WOT lockup option off which you do by setting WOT lockup to gear 5. Set the minimum RPM to 1,800 rpm as that will keep the RPM up when accelerating and keep the shift points from allowing the engine to drop too low in rpm. Then again look at the factory Tow/Haul settings for an 02 Astro Van and they will get you close. The overall gearing and powerband of the engine are very similar. For Tow/Haul I would set all the command shift times to 0.300 for 1-2 and 2-3 and set to 0.00 for 3-4. Anything over about 260 ft/lbs of torque should have a 40% torque reduction for 1-2 and 2-3 upshifts.
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