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As mentioned above, a high pinion (or reverse rotation) gears were designed for the front so they were powered on the drive side of the gears = stronger. Put a high pinion in the rear and you are now running on the cost sides = not as strong. Same type of situation but reverse of a low pinion (standard rotation) gears......powered on the drive side when in the rear but cost side if in the front.
I periodically hear about people blowing out the R&P in high pinion rear 60's in rigs like TJ's with 38's, but this is all second hand and I'm sure only a small percentage. A guy in our club has one in his YJ with 37" Boggers with the 4.0L, NV4500, and 4-speed Atlas (manual combined with low gears = more stress). He's been beating on it pretty hard for a couple of years now, including a stint on a set of borrowed 42's, with no issues so far.
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