When you tow with your 16,000 pound loads, can you guys with automatics pull overdrive, if so something is seriously wrong with my truck...
I only get about 20 on the highway...Dieselman3500 asked the golden question, is it in the powerband? 3.56 gears are pretty high, I bet you get great fuel mileage when you're unloaded.
Ok, that makes sense, i guess i will just have to run OD off the whole way there 6hrs, wont hurt anything will it?You need a set of 3.73 or 4.11 gears. I have the same rear set as you and the sweet spot is up around 1800rpm or so. If I get down to 1500 and come to any hills or in town it is out of OD right away and locked up. I pull about 13K on a regular basis and you do not want to bog the engine down. Bad ju ju, too much strain on the drive train!!