I no longer use synthetic diff fluid in my 98 chevy Z71 truck. It may be a coincidence but when the truck was fairly new, I changed both diffs over to Mobil 1 diff fluid. At around 55,000 miles, I began to notice some rear end whine. I finally had it looked at at about 75,000 miles when the noise was getting pretty loud.
Shop tore it down and the pinion and carrier bearings were shot. This was on a truck that hardly ever pulled or hauled anything. I had it fixed and now at 130,000 miles, everything is still quiet.
Wayne
Shop tore it down and the pinion and carrier bearings were shot. This was on a truck that hardly ever pulled or hauled anything. I had it fixed and now at 130,000 miles, everything is still quiet.
Wayne