Join Date: Apr 1999
Location: Chugiak Alaska
Feedback Score: 0 reviews
I always use synthetic fluid in the diff. I tried without it once and could feel/hear the LS clattering. 4 oz of modifier did the job. I had close to 300,000 on my last 99 and LS still worked fine. I always pull rear cover and take a look, reseal with RTV and let set for a day before refill.
Early 1999 F350 AUTO 4x4 CC LB DRW 4.10 6.0 trans cooler, Front hitch, 2,000 hubs/ brakes, Bilstein shocks/steering stabilizer, Diesel site coolant filter 203 thermostat, EBV delete, new O-rings, new Oil cooler, RIFF RAFF FRX, Glow plug led, Pillar gauges, Lighted cupholder, Painless wiring fuze block, Harpoon/hutch mods, Removed axle blocks. Air bags, 5 wheel hitch, In bed 7 pin plug. Spare tire key delete. KLHANSEN on speed dial. 75,000 as of May 2019