I tow with the 4.3 converter in mine. Footstalls about 2,200 rpm behind my cammed L31. My torque converter locks in 2nd gear at 55 mph even at WOT so it stays cool. With 3.42s you need all the help you can get to get you rolling. I could do nearly 60 mph in 1st and 100 mph in 2nd with 3.42s.
You will need to upgrade the DRAC to one for a 93+. The earlier ones do not output the correct signal to operate the transmission. 4L80E uses both a VSS and Input Shaft Speed sensor.
I added an aftermarket factory style transmission cooler and lines for a 1-ton van. Combine with the radiator cooler it always runs cool.
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