The 35 is weak but there are guys running 37s on it lot depends on how you drive or how hard you push your jeep, There was aguy in club who ran 39s with the 35 and i think he did break astock axle, but he was not easy on his jeep,he went just about everwhere at MM off road park.unless you just beat your jeep to bad or pocket full of money i stay with the 35 you have the good axles already.