The best manual you have is right here at your finger tips! There is so much information available, everything from flushing your tanks to major modifications and improvements. If you have trouble finding anything on a search feel free to simply ask whatever questions you may have and someone with an expertise in that area will probably respond to your question fairly soon.
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2011 GMC 4X4 dually CC, 6.6 Duramax with Allison Transmission. Formally 2001 Montana,2007 3400RL Montana, presently 2018 3401RS Alpine.
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