Please note this is not my recommendation. It seems to boil down to what you use the truck for and a matter of personal preference most of the time. Wipe off oil anywhere you can get to on the gears and walls inside the axle. Installing a replacement gasket is also optional. My factory sealed diff didn't even use a real gasket, only black silicone sealer. For Single Wheel - Not For Dualie. But 100k is enough to burn the best fluid in the rear diff.
It is indeed some expensive lube. From what I read you don't need a friction modifier as its already has some in it. My experience is with mostly Japanese motorcycle engines where the engine oil also serves as a lube and coolant for the primary drive, clutch, and transmission. This is what I have been doing in my personal truck. Wilma Wilma-Colorado wrote:If you run modern automotive oil in your single-lube motorcycle engine it will cut it's life dramatically. If you use Royal Purple 75W-140 axle lube, the modifier is not needed.
Was thinking either lucas, mobil ls or a sythenic. For Single Wheel - Not For Dualie. Same for truck transmissions and axles Just my 2 cents worth with a sprinkling of related experience. This link also has a vintage vehicle lookup, along with a power sports oil and filter guide. Everything was nice and solid. Lockup Differential Assembled with Axle Shafts and Backing Plates.
To fill it or check the level remove the level inspection plug and stick a finger in the hole to feel for oil. If you feel it no problem. I started at the bottom, moved up the sides, and finished at the top bolt. Some applications may vary based on cooler size and if equipped with an in-tank cooler. The old fluid was really black and dirty. I knew I had lost a lot due to some leaks and bad seals and then pulling the axles. But 100k is enough to burn the best fluid in the rear diff.
If it is low I wouldnt buy more than a Pint at a time and check again. Personally I wouldn't do it. Please call for customer service and availability at 1-800-886-2815. I ordered that too as I do a lot of towing and I found the axle fluid gets very hot. Has Backing Plates and Axle Shafts.
What is the thread size of the oil drain plug? Call Surefire at 1-800-790-9094 for customer service, availability and technical assistance. I've tried Amsoil, ford, and Mobil 1. People take their differentials for granted untill it's too late. No facts to back up my opinion, other than the long service life that my units have endured. Please call for customer service and availability at 1-800-886-2815. Differential Gear Oil F250 Super Duty,F350 Super Duty Front,Dana 60 Axle 5. Something to do with the environment, I'm sure.
I have tried front diffs at 100k, 200k, and 300k intervals. It's got a couple miles on it and all is well. Loktite is optional on the threads of the plug. The seller is on this site somewhere. The wiping action of helical or hypoid-cut gears transmitting multiplied torque and high horsepower at high rpm destroys the oil's ability to both cling and stay slippery, that's what the absent zinc and phosphorus would have done if they were in there.
This page will be expanded as time permits. The truck had 140K when I got it and I changed it at about 150K. I have seen other members here advocate 50 weight and a good many synthetic blends as well. The manufacturer's names or trademarks used herein are referenced solely for identification purposes and are not intended by superdutypsd. Indicates only approximate dry-fill capacity. Tags V414, V419A, S412B, S413B, S406H, S409H. Note: Some Ford techs recommend not using the Ford spec 70W140 synthetic due to it not being able to absorb water and possibly leading to corrosion and failure of parts within the axle assembly.
Dana rear axles also contain a synthetic lubricant but do required a change. F-150 Rear Differential Oil Change This procedure was performed on a 4x4 with 4. Includes Remote Filter Element Change. Lockup Differential Assembled with Axle Shafts and Backing Plates. That's what I remember, by the way; please correct me if I'm wrong. This article has been generously donated by Peter Ferlow. I think it may of been done in the past.