Four Wheeler - - Feature -

Du­ra­max/al­li­son combo is a 400,000-mile propo­si­tion, if not more

LBZ Du­ra­max came with a higher in­jec­tion rate (26,000 psi vs. 23,000 psi) than on ’01-’05 en­gines, which ac­counted for the 50hp gain over the LLY

Al­li­son trans­mis­sion gained an­other gear on ’06-’07 mod­els (i.e., dou­ble over­drive)

Tap­shifter and highly ef­fec­tive Tow/haul mode greatly im­prove tow­ing per­for­mance and con­trol

IFS pro­vides ar­guably the plush­est ride in the 3⁄4-ton seg­ment

Lighter curb weight than com­pa­ra­ble Su­per Du­tys or Ram HDS (also a con)

Thanks to their light weight, IFS, and dou­ble over­drive trans­mis­sion, these trucks typ­i­cally get the best mileage of the Big Three when empty

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