I totally agree with your feelings toward maintenance & repairs to your truck. I've owned my F-150 since new, and I do all the maintenance & repairs. Even though I'm a Machinist not an auto repair tech. I still manage to figure out how to work on my truck. Of course I change my own oil, but I also have changed the transmission fluid (6R80), replaced the OEM connectors on the transmission lines to rubber hoses, installed a CAI, installed a catback exhaust, and a engine oil separator.
WOW!! THIS SHOULD BD TITLED "ALL YOU NEEDED TO KNOW ABOUT GEAR OIL,BUT WERE AFRAID TO ASK"! ONE OF THE MOST INFORMATIVE AND IN-DEPTH VIDEOS IVE SEEN DETAILING THESE SPECS! THANKS FOR YOUR EFFORTS!
Ya, I'am just not so sure with the 75W85 Warranty Thing. I'am an AMSOIL Dealer, And I would say If you are going this Far to Actually Service your Diffy, Unlike Most Normal People who don't even know what a Differential is, Even If you "TOOK THE CHANCE" and put in the 75W90 / 110 / 140, You wouldn't have any Issues and would (In My Most Humble Opinion) be doing your Diffy a Real Favor. These Newer Oil's / Gear Oil's are Designed to Handle COLD and HOT Temperatures and Still Protect your Gears and such without Damaging them. Staying with the FACTORY recommended OIL certainly is by no means Wrong. But I do Not believe using any other "HIGH QUALITY GEAR OIL'S" is going to cause any Damage to anything at all. And YES, If you have an E Locking Diffy, You DO NOT USE ANY ADDITIVES. Watch FordTechMakuloco Brian Is a FORD GENIUS! Decent Video, and Ya DUMP THE MUSIC kinda interferes with your speaking.
Great information. As a "researcher" too, I appreciate your effort. Thanks for the research on the gasket and contacting manufacturers. I went with the amsoil 75-90.
I was on the Ford parts site and the gasket they show has a embedded o-ring type seal part# HL 3Z4036A for years 2014-2020........$50. I havent done mine, but sure curious. FYI 2019 F-150 12 bolt cover
Hmm. Im still kinda confused with the years and all. I have a 2012 f150 3.5 ecoboost super crew and i have the e-lock.. but in video said only the newer ones came with? Im about to change my diff fluid cause at around 50-60mph i hear a rumbling noise till i get to 70 then it smoothes out. So for mine do i use the 75-140? Or? Sorry its ny first truck ever so its all new to me still.
Just went thru this hurdle. Ended up RTV and using 75-90. It covers the spec. All good. That gasket was pricey. Nobody will know you used 75-90 oil in diff unless u tell em. Like you said it’s ok.
For some of our older trucks with 8.8 differentials like my 2003 f150, Ford did put a 75w-90 in at the factory which often resulted in a whine that was remedied by a kit and a recommendation for 75w-140 oil to replace the old fluid. In spite of this TSB (05-23-3) the parts counter at a local dealership told me to go with the 75w-90 as specified on the tag from my differential cover. Could they make this more confusing?
Just found this out today. Bought a gasket from rock auto and no way it was going to fit. Had to walk to Advance Auto near me and buy the Right Stuff sealer to get the job done. Letting it dry overnight for dry. Jees...
i have a 1987 f150 302 10 hole cover 3.55 8.8 differential non locking what viscosity gear oil should I be using . I can't seam to find an answer anywhere . Thanks
@@tommyholt3465 - A mechanic once told me that the reason they did that is because a true transmission service requires a new filter...so they figured if there was no drain plug in the pan, you'd have to take off the pan and filters would get changed. If there was a drain plug, many would just swap fluids which would be like doing an engine oil change without replacing a filter. But the funny thing is that some newer transmissions have a lifetime filter so they now often have drain plugs. My wife's Escape has an internal filter that requires the case to be cracked open...so it's basically not serviceable. But it does have a drain and fill plug so I just swap fluids in that every 30k (and NOT the 150k Ford recommends).
My 2015 has the super HD 8.8 12 bolt. I found out the hard way by ordering the 9.75 differential cover and lube locker gasket. I then sold that one. And you’re right. Could only find the gasket from Hyper tech. Anyway, got it done. My manual says 75w 95w. Got that with Amesoil and the differential cover is a B&M aluminum with the carriage bolt supports. Easy install and looks great. The added 1 .3 quarts helps with extended gear life.
Do yourself a Favor and go watch Gayle Banks Video Right Here On RU-vid, on Aftermarket Diffy Covers and How they Actually Aerate the Gear Oil's, and the ADDED 1 . Whatever Quart (s) is Useless! Only Bummer is Banks don't make a FORD Cover for our Smaller Diffy's. Or I would hav Bought one Already! Please go watch his Video, It is a Very Informative Video, from a REAL EXPERT on Oiling you Diffy "CORRECTLY"...
You trust Royal Purple over Redline 😂😂😂😂. Good thing it’s a F150 and not tracked car. Motorcraft doesn’t make oil. They have a company like Mobil/Exxon blend it to their spec.
