no way to tell. we have 1 member whop never raced and did a burnout in his driveway and lunched the diff. mimisrt races weekly and hasnt had an issue. my buddy races in a bracket class and ran all last season. did a maintenence teardown and the spider gears the roll pin ring and pinion were all toast. doesnt even know how the diff was still turning . i guess the biggest concern isnt that the diff will fail its will the wavetrac be available when you need it. we had 22 built in the group buy and im told a total of 50 were made. more have been sold since the buy and nobody knows how many are left and if autotech will build more if needed. would suck if you need the unit and the last unit sold a week before!