I have a 2000 Ultrasport with Cummins and Allison. I've found that going to "manual" mode on the tranny and stay in 5th gear at 2000-2200 rpm gives me enough power with some reserve and economy. If on long flat stretches , I'll go to 6th gear. I travel about 60-65 most of the time. Works for me.
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2000 Damon Ultrasport 3670
DP Cummins 5.9
Tow Dolly, 06 GMC Envoy
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