Jim-n-Leslie
Active Member
I spent today cleaning up my rear differential on my F350 SuperDuty Lariat Crew Cab. I couldn't be more pleased with the results. I bought the Mag-HyTec cover, six quarters of Royal Purple (75W-90), rolled up my sleeves, and headed under the truck. As the photos show, the old cover was quite rusty. It would not take much to punch a hole through the old cover. I pried it off, I sopped out the old oil, cleaned up the mating surfaces with wet-n-dry cloth from the auto store, cleaned everything up with solvent, and closed it up. Torque'd down all of the bolts to spec. The original was supposed to have 3.4 quarts of oil. It had two. The new one takes up to six quarts, but five brought it half way between the hi and lo marks. I drove it a bit to see how it felt. It does have some slip (being a limited slip differential), so I will add the additive tomorrow and check the oil level. Next weekend I will do the front differential. I got a Mag-HyTec for that as well, and four quarts of Royal Purple. Besides looking great, this should do well for keeping the towing/hauling temps down and ensure plenty of lubrication through the upcoming summer months. I can't wait for our first camping trip!