Willy, did not have the van but i had a 2005 silverado 2500HD with 6.0 and 4.10 gears and i was getting better milage on the highway and same in the city as my current suburban 5.3 with 3.73 gears. I hope that helps.
FWIW, i was pulling a 7500 lbs boat without even know is there.
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GIORGOS/TAKE A KID FISHING
1981 FORMULA F-233 UNDER COMPLETE RESTORATION.
2008 GRADY 336 T/350'S
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