Don't get me wrong the Meritor is a huge advancement over the manual tranny (although many still love to jam gears) But the 6 speed automatic is so much smoother. This is not a big deal for the driver, but put passenger in back and a jerking tranny will make even the best passenger motion sick in stop and go traffic.
If your conversion is all business than the Meritor is the way to go. But if your hauling passenger and your rig is setup for travel and fun the Allison auto is the only way to go.
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2012 Showhauler 28'6" Motorhome on a Columbia w/ 450 Mercedes.
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