I hope this helps you. Note that this is for the M210 Front and M220 Rear axles. If you have a different front axle, you might want to check with Dana Spicer. I understood the recommendations were for synthetic gear oil. I did add the Mopar limited slip additive as I have a clutch pack in my M220 Wide rear axle and Dana Spicer gives a spec for additive fill volume. I know, Valvoline says not required for their synthetic gear fluid, but since I’m following Dana Spicer specs, I did.
Should say clutch pack.
This is the correct answer. 75-W40 is also what Dana Spicer specs as the correct weight oil.Is this the first time???? 100K??
A quick google search came up with this: The 2018 Jeep Wrangler JL rear differential (M220/Dana 44) requires approximately 1.22 to 1.53 quarts (1.15 - 1.45 liters) of fluid. For most applications, a 75W-85 or 75W-90 GL-5 gear oil is recommended, though 75W-140 is often used for towing.
Can't hurt to use the 75/140.
G.
Yes, M220 Wide rear axle. Sorry for the typo.
on the dana spicer main website
well I posted before and got lambasted but I called dana spicer and they told me to use what jeep recommended ie 75W85
dana spicer sells 75W85 gear lube branded under their name but not 75W145 which I found odd but when I posted that others did not think it was odd....
Interesting. All I can say is that my M210 Wide HD front and M220 Wide rear axles with 4.56 gears with Valvoline 75W-140 synthetic gear lubricant runs noticeably smoother than the factory fluid. Another interesting post on this thread suggested that the heavier weight gear oil would run at a higher temperature than 75W-90. That is not my observation but without real data that is just my opinion. Anyone run these lubricants back to back in temperature tests and collected real data?well I posted before and got lambasted but I called dana spicer and they told me to use what jeep recommended ie 75W85
I have run both mopar 75w85 and valvoline 75W140 in my rubicon and literally can tell no difference in sound or feel or mpg etc.. I can't find the post but someone put a remote temp sensor in their diff and posted their findings, I can't remember if on this forum or the other one. . personally i don't think it matters one iota what a person uses as long as they don't run it contaminated with water. everyone needs to do what makes them comfortable.
My copies came originally from the JLForum here, either Transmissions, Axles, Gears or Maintenance, Lubricants technical forums on the site. This was three years ago. I verified their content on the Dana Spicer website. JADMT gave you the current website Dana 44 Ultra, with lubricant, as a good example above. I checked and that does give a gear oil specification, 75W-140. So I agreed with his post. You still have a bit of work to identify your axles in your Jeep and then track down your specific Dana Spicer spec sheet. With JADMT’s good help, you now know how to do that. I can tell you that your spec sheet for your rear axle will be what I posted as that is a Dana 44, isn’t it? I can tell you that if yours, like mine, has the limited slip clutch pack, you will notice a smoother low speed operation. I note that the Rubicon owners with Tru-Lok electric locking Dana 44 M220 Wide axles are not noticing a difference, per a couple posts. If your front axle is a Dana 30 (M186?), run that down on the Dana Spicer site and get your current spec sheet. Up to you to decide what it says is what you want to do, or follow Jeep specifications. Funny, normally I am the guy saying to follow Jeep specifications, but not on axle lubricants or frequency of service (much more frequent than factory recommendation). The Forum here does a good job oh allowing you to hear multiple views.
