Greetings Army Man. A few humble opinions: Cat engines can be great, but I can't speak fo the 3126. Stay away from Allison automatic transmissions. A 4.63 rear will probably provide pulling power but will be screaming engine rpms up and down the highway. The KW T300 has lots of limitations; go for a full HDT. The heavy duty truck, class 8, comes with million mile engines (maybe at a price)and if you don't want their big, stick shift trannys Eaton auto shifts or Arvinmeritor Freedomline autoshift transmissions are worlds apart from the Allison automatics, and get you mpgs you'd never believe. Patient shopping around, truckpaper.com, racingjunk.com, etc. will get to some reasonable prices, but sure check out thecondition of the rig. Big repairs on big rigs are not cheap. Keep looking and good luck.
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