So I bought a fj60 at the start of the summer and as expected it had been previously neglected and a laundry list of repairs needed, after replacing master cylinder, front calipers and pads, wheel bearings, rear brake shoes and wheel cylinders, rebuilding knuckles and birfield, thoroughly inspecting all axle shafts and differentials (ring and pinion appear brand new, as well as aussie locker showing not even the slightest wear) I'm lead to believe that the pinion bearing is wearing out. The reason I suspect this is at highway speeds there is a persistent hum from the driveline, and when rotating the pinion flange by hand with the axles removed there's inconsistent resistance that feels like debris in the bearings. I stopped short of pulling the pinion out since I didn't have a bearing press or gauge to measure and reset the backlash and didn't have new bearings to replace them if they were worn. And the possibility of having a crush sleeve made me hesitate tearing it apart. A local shop quoted me 1000$ to rebuild the pinion and carrier bearings, another mechanic said it'd be easier and cheaperto replace the whole axle. My question is two fold: is 1000$ a reasonable quote for a rebuild. How involved is rebuilding it myself? I've found a kit for under 200$