hello i have some personal experiece on this one i installed detroit easy lockers in my 84 toy and had 4.11 gears lockers and abuse ..lol destroid the crush sleaves due to added stress on pinion gears p.s. 35 inch tires then i installed 4.88 gears and lockers in with crush sleave eliminator kits and have pulled checked diff.s pattern is still perfect after 3 years pinion is good and still tight not like prior crush sleaves and have broke 3 berfields and partialy stripped det locker but gear and pinion are fine due to the strength of the crush sleave eliminator kits check it out for your self hope this help need more hit me us GOOD LUCK IT'S NOT EASY took me two weeks for first diff and tree days for second same situation as you got try allprooffroad.com they got the stuff !!! <img src="/forums/images/graemlins/cheers.gif" alt="" />