IMO where you wheel, and competency of the play a HUGE role. I have seen lighter rigs with smaller tires break where a heavier rig with bigger tires did not, simple because the driver of the larger rig knew when to let off the skinny pedal.
i feel confident beating on my bone stock d60 with my 38.5's around here. I honestly don't even think about an axle breaking. However, in a high traction place like rock crawling, i would be a bit more leery of broke parts on a stock 60.
under my 6000lb blazer, my current 38.5's are about as big as i feel confident with. get some chromo's and full 35 splines in there and i would have no issue wheeling 42's with it and my moderate 200HP stock 350.
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beat up rusted out k5
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