I agree driving style has EVERYTHING to do with it. I am somewhere aggressive. However on my dana 44 setup I was breaking shafts on 38's and an old timer told me I needed to "learn how to drive a dana 44."
He said the "hard turning" of the wheel back n forth and fast tire spins are usually what gets the 44 shafts. I havent slowed my wheel speed down much, but I have slowed my steering down a good bit and keeping in mind that "in a perfect world" I want to keep my wheel as straight as possible since this is how he explained it to me...
Keeping in mind that little bit of info has greatly decreased my shaft breakage, matter of fact I haven't broken one in over a year. I would assume this theory would hold true for a d30 and 35" setup...
Great discussion btw guys!
All that info goes out the window when you put in RCVs. I have video of me sawing the wheel back and forth at 4k rpm to try and climb a rock. Ive also powered up undercuts and was just waiting for something to break. They are truely install it and forget it shafts.