The differential on my Chevy van started making growling noises while we were in the Yaak (Montana)last summer.I drove it the 2000 miles home anyway without breaking down.Got estimates for repair for $500 to $800.I'm not an auto mechanic and hate working on autos.Anyway,I pulled up some things on utube about the Detroit locker that Ihave.It didn't look too complicated,so I dived in.I had a bad carrier bearing and a bad pinion bearing.I bought a bearing and seal kit from Oreilly for $70 and dived in.I had to buy a dial indicator to check backlash and an inch pounds torque wrench to set the bearing preload.Took my time and everything went fine.My total cost including tools was around $150.Thank goodness for utube.