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Originally Posted by HUMTECH
Its normal, the larger the tire diameter will translate into more movement from gear lash in the differential and the transmission as well as the t-case. Your buddies truck that is stock will not move near as much due to the smaller tire. Also yours may even move more due to a little wear in the gears if you have more mileage. If you had no gear lash parts would chew themself up in the diff, t-case and trans. Compare to a truck with similar mileage and tire size and ill bet its close to the same
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If the ass end was off the ground, i agree theres some play...but w/ the weight of the truck on the wheels - being able to move them still, that doesn't seem right. My 38" rears dont budge sitting on the ground. I only have 34,xxx miles. If its a high mileage thing, obviously something still needs to be replaced.