Removal of broken differential pinion shaft lock bolts in GM and Ford integral (WER) type rear ends can be time consuming and frustrating!. Often the differential pinion shaft lock bolt is found in a broken state when servicing this type of rear end. Removal of this bolt is required to perform any type of service. From axle seals to complete overhaul this bolt must be removed. The removal of this lock bolt is essential in performing rear axle replacement, rear axle bearing replacement, rear axle seal replacement, most differential repairs, as well as all differential overhauls and rebuilding