I have broken every brand gears out there except for stock chevy gears. My truck has an 8.6 10-bolt and weighs 4800lbs, so I may not be a good point of reference, but I was going 11's with slicks, driving it 70 miles a day, and towing my dad's impala once in a while with stock GM 4.10's and never had a problem with them. Richmond, yukon, and motive...broke all of them more than once.
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