Hello folks I just bought a 1989 GMC Suburban V1500 350TBI 700R4, and it came with a crunchy grind from the front end. I took the front wheels off, and found the inner side of of the right front rotor to be heavily scored. I took the caliper and pads off, and found the brake pad on the caliper piston side to be down to the metal. Interestingly, the other three rotor surfaces, outer on the right and both on the left, were in great shape without even a lip and with the bevel seemingly as new. The seller had replaced the rotors with slotted aftermarket models, though the calipers were still factory. I think the right caliper was not retracting properly, and ground down the pad and rotor surface. What followed was a frustrating journey of many days with a major auto parts chain, who first sold me the front rotor hub for a RWD Suburban and then sold me a damaged hub rotor assembly! I now know to inspect parts in detail before leaving the store. But now all is good. I put new bearings in the new hub rotor, (which came with the races installed) and a new inner seal. The Haynes manual had funny instructions for tightening the spindle nut on a hub with a manually locking system. - Torque to 50 ft lbs, back off 90 degrees, tighten to 35 ft lbs, back of 3/8 of a turn. This resulted in a spindle nut that was not even finger tight. Why would they mix units of rotation? What does 3/8 of a turn mean? I interpreted it as 135 degrees. Does it have a different meaning in Haynes - speak? I ended up putting the wheel back on, and tightening the spindle nut arm strength (not body weight) tight with a two foot handle half inch drive. Then I grabbed the tire at noon and six o clock and tried to wiggle it. It was tight. I then spun it with one hand starting at noon, and the tire spun about 3/4 of a revolution. I then put my hand on the side and gave it a bigger spin, and it spun about 1 1/4 revolutions. I decided this was appropriately snug. I then put on the spindle washer and lock nut and Warn locking hub assembly with its spring clip that fits against the inner lip at the outside of the hub. The drivers side rotor is in such good shape that I left it as is, even though it means I have a slotted rotor on that side and a factory style rotor on the passenger side. New brake pads all around now give a smooth strong stop. The vehicle doesn't pull to one side.