You will climb them at speed but use the tap shifter (6 speed equiped) before the trans needs to shift, keep up the rpm, I pulled from Tampa to MI up 75 and I never slowed below 65, I also ran 70 thru Colorado and Utah and the same, just keep up the rpm. I have did both trips with a stock truck and not so stock.
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2012 Wildcat 344QB
06 LBZ ,CC 4x
lots of mods
Superglide
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