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I am currently looking to upgrade my current truck to a 2015 3500HD and Inn the same boat (gas versus diesel). My 6.0 gasser serves me well Towing the 12k fiver, but would wouldn't recommend gas if planning on Towing anything over 10k full time or cross country.
The 6.0 gas drive train is bullet proof. I will say that. Also, if you do go with gas, 4:10 axle is a must have for any trailer over 9500 gvwr. (per gm)
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