i have shredded 3 sets of 9t bevel gears part # 102692. (Rear Diff) (6s as ive ran since i bought the truck back in 2013) Prior to this as stock my savage flux hp has been a beast. Since the lite modifications,: XL Extended chassis, extra lagre trenchers I'm running, all of a sudden, it startedchewing up internal differential gears, fronts rears maybe 5-6 different times, finally rebuilt them right, with 30k weight diff fluid, differential internals are holding up well, though not even a set of batteries would the truck burn, it started chewing up these bevel gears. On the fone with HPi, teling me i havr binding issues in drive train. Dog.bones are all brand new as they came with extended chassis. Though bulkheads don't go together as tightly as they used to as most of the screw holes are stripped out and don't create a tight grip when fastening all together. I'm hav ordered all new bulk heads and new bevel gear. And praying the fresh bulkheads are going to solve the issue with binding in the drivetrain causing the truck to chew up these bullet proof bevel gears. If the bulkheads don't solve the issue, i have no idea what else it could be. Installing everything via owners manual specifications other then bulkhead screws arent tightly screwing back together as they are stripped. Though the whole didf setup buttons up nicely once put back together. I think this has tricked me into going thru all these precious expensive bevel gears. Any advice/motivation would be great thanks.