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Edit: I just read your post more carefully. It’s cheaper than regearing the diffs! Plus you get the chance to put in low range gears.
I went to 35 inch tires from 33s and never regeared the axles. I drive a ton in the mountains and the truck felt terrible climbing steep hills at altitude, stuck in the right lane the the semis. These underdrive gears at like installing 4.56 gears in the diffs. Friends have noticed better mileage since the engine is running closer to its best rpm more frequently
I went to 35 inch tires from 33s and never regeared the axles. I drive a ton in the mountains and the truck felt terrible climbing steep hills at altitude, stuck in the right lane the the semis. These underdrive gears at like installing 4.56 gears in the diffs. Friends have noticed better mileage since the engine is running closer to its best rpm more frequently
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