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jbadtoy 10-31-2007, 07:05 PM I have a 99 gmc 3500 dually 6.5 turbo with 35' super swampers, my question is what gear do you guys tow in d or 3. I had a 94 3500 dually and on the door frame it said not to tow in d only in 3 but the 99 does not have that sticker. 01Duramax6spd 10-31-2007, 10:33 PM 4.10's or 3.73's? Rttoys 10-31-2007, 10:53 PM Leave it in 'D', the computer will take care of the rest. jbadtoy 10-31-2007, 10:56 PM 4.10's or 3.73's? I think 4.10 3500? Josh61513 10-31-2007, 11:07 PM 4L80 transmission on the '99? Should be okay in overdrive. nickm3 11-01-2007, 11:14 AM D unless it starts to hunt back and forth then go with 3. nextlevel38 11-01-2007, 05:04 PM 6.5 with 35" swampers i would be using 3rd.. depending on the weight you are towing.. 6.5silverado 11-04-2007, 09:45 AM the 3500 will most likely have 4:10's, and i agree unless it starts hunting between OD and 3rd just run it in D | ||