GM 6.0/4sp vs. 8.1/Allison vs. 6.0/6sp
Hi all. My Towrig in Sig is getting a little long in the tooth. We just bought a New to us Toyhauler which is quite a bit heavier than our old trailer and my truck is hating life lol!! We were pla...
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I have the 8.1 towing my signature rig at 15K pounds. I always tow in OD and have no problems. I towed with and without tow haul on. I get a little better mpg out of tow haul mode. I just went on a trip with my brother who has a smaller fifth wheel and powerstroke f250. I paid a little less for gas than he did.
