It all depends on how you wheel. If you take your time and make a concerted effort to keep all four wheels on the ground, the D35c will serve you well. All or nothing kind of Jeeper? Eventually you may damage your D35C with 33's or even 32's. Looks at all the blown 35c videos on YouTube and see what led up to many them. I am currently running 33's with my D35c, but I wheel (crawl) very slowly; 4WLo. If I was crazy fast I'd probably granade it. But I baby it till I can stick a D44 under there. I am stopping at 33's. So far no issue. And I agree that is it not money well spent to upgrade the 35c. According to my calcs, an axle upgrade can run upwards to $600 bucks or more. A Salvaged D44 axle, a grand or so. I'm gonna lock my D30 to 'help' my D35 keep up!