What the Allison won't do is take care of your engine temperature. Hot temps at altitude hurt you twice. They raise the heat load and altitude makes things work less efficiently. The VMSPc is a great investment.
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Jim and Jennie, Cats=Bittles and Potter, 2000 Dynasty 350 ISC
2013 Silverado 4x4 Towed with R1200GS in bed.
PROV23:4 Do not wear yourself out to get rich; have the wisdom to show restraint.
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