I have a 97 f250 7.3l psd with a sterling 10.25 12 bolt rearend that keeps locking up. The dial pin retaining bolt keeps breaking and letting that pin slide out. The first time the bolt sheared and put a hole in the cover and killed the pinion bearing so I fixed then the same thin happend but the bolt ground the pinion up so I replaced the carrier all the spider gears , ring gear and pinion and all the bearings. Then the other night the pin slide out and I was only going around 8 mph and it locked up. I installed everything right and gave it the break in period. I have a superchip micro tuner but I don't think it would push enough torque to keep breakin that bolt when its not suppose to have pressure on it.

 

what are you torqing that retaining bolt to?

 

Im not sure. I know that if its to tight you'll crack it and it'll break and if its too loose. But this is the third time this has happend