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The Pinion shaft size is smaller in the 12 bolt, but it doesn't have bigger bearings and a bigger ring gear, not sure how much the size of the pinion shaft matters, but I do see broken pinions in the off-road world.
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1985 Scottsdale Shortbed 4x4
Stout 350 with some "upgrades"-700r4-33x12.5" Mud Tires, Warn 8274-50 winch.
2005 Chevrolet Colorado Regular Cab 2wd 4-banger, 5 speed, Street Pack with 3.73 axle.
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