It would take quite a bit to break a detroit locker...I am thinking a lifted 4x4 and a seriously powerful big block...even then, detroits arent the weak link, the driveshaft or u joints should go first.
lockers normally make noise on the road. they pop and clunk when you go around corners if you dont have the gas all the way mashed to the floor.
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1969 GMC K2500 
1996 Honda Accord
2007 Kawasaki KLR 650
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