Differential/Axle Fluid

[just_another_guy]

I had inquired about the rear diff gear oil with Jeep and received this response:
------------------------------
Thank you for contacting Jeep.

VIN: xxxx

Our records indicate this vehicle was equipped from the factory with the following:
AJQ Max Tow Package W/4.10 Axle Ratio
DJF Dana M210 Wide Front Axle
DRF Dana M220 Wide Rear Axle
DSA Anti-Spin Differential Rear Axle

Front Differential/Axle Lubricant - We recommend you use Mopar Gear & Axle Lubricant SAE 75W85 (API GL-5) - P/N 68378949AA.

Rear Differential/Axle Lubricant With or Without the Trailer Tow Package/Max Tow Package - We recommend you use Mopar Gear & Axle Lubricant SAE 75W85 (API GL-5) - P/N 68378949AA. Models equipped with Trac-Lok Limited Slip Differential (Anti-Spin Differential) require the addition of 70 ml (2.37 oz.) Mopar Limited Slip Additive - P/N 04318060AD.

Sincerely,
Joe

Sponsored

 

[3213JT]

One of them is wrong. Either 75W-85 or 75W-140 was put into the rear axle of my Gladiator at the factory. I am certain that Jeep has records of what oil was being put into the rear differentials of Max Tow JTs in early September 2019. That fluid should be what I replace mine with. UNLESS, Jeep is implying in its manual that in order to get the safest/maximum towing capability you need to switch the rear axle 75W-85 with 75W-140 fluid, and go back to 75W-85 when not towing. And if differentials go bad from the wrong lubrication, I wonder how hard it would be to convince Jeep corporate that they messed up in telling thousands of Jeep owners which fluids to use.



For now, I'm going to wait to hear back from Jeep as I inquired about the discrepancy. The answer is not coming from OEM suppliers, it's from Jeep's people. I have at least 2 people involved in the JT's development on technical matters telling me 2 different things. Both are looking at Jeep/FCA/Stellantis official internal documents, so eventually I'll get an answer that I can bank a potential/future (hopefully will never happen) warranty claim should the wrong differential fluid cause damage to my rear differential.

Well, it about that time for me to change my rear end oil, did you ever hear back from Jeep?

 

[rharr]

go to the parts store and buy what ever 75w85 75W90 75w140 synthetic you want. if you have a limited slip diff then add the friction modifier. The oil weight is less important and it's more important to change the stuff every now and then. If you tow a lot or live in the desert go with 140, or just be happy with a full synthetic 85 or 90.

 

[PyrPatriot]

Well, it about that time for me to change my rear end oil, did you ever hear back from Jeep?

Unfortunately not with a concrete answer

 

[jc99]

Dealer added (Mopar Lubricant-Axle 4318060Ad) to my front and rear diff oil change on my Rubicon with electric lockers. I can't imagine it will harm anything but wonder if the friction modifier could cause the e-locker to be hard to engage/disengage. I had a few issues with them, not sure if if it was just the situations when they were engaging or if the friction modifier played a part. Anyone have any thoughts???

 

[Rusty PW]

Dealer added (Mopar Lubricant-Axle 4318060Ad) to my front and rear diff oil change on my Rubicon with electric lockers. I can't imagine it will harm anything but wonder if the friction modifier could cause the e-locker to be hard to engage/disengage. I had a few issues with them, not sure if if it was just the situations when they were engaging or if the friction modifier played a part. Anyone have any thoughts???

You're good. The additive won't hurt.

 

[NellyTooTall]

What part number are y’all seeing when actually trying to buy the 75-85 Mopar?

 

[HappyGladiator]

Going to be installing ARB diff covers soon. Will be using Torco 85-140 non syn rated GL-6. A very high quality oil. I am wondering if the diff covers come with re usable gaskets from the factory?

 

[Rusty PW]

Going to be installing ARB diff covers soon. Will be using Torco 85-140 non syn rated GL-6. A very high quality oil. I am wondering if the diff covers come with re usable gaskets from the factory?

The oem cover gaskets are reusable. Just wipe them off really good before reinstalling.

 

[Waynerd]

The oem cover gaskets are reusable. Just wipe them off really good before reinstalling.

I am a newbie, but I decided to do my diffs myself. I’ve been researching for weeks, most of the good stuff comes back to here.
I wanted to share one thing I saw, and get opinions, as I am in sari Arizona, where we experienced a month of temps over 110f.

This is in a Spicer spec sheet on the

Dana axels…

It looks like if we are in temps over 100F regularly, we should use the XXw-140, it’s for a different axel I think, but it seems that this is generic or standard.

The doc is
“Service Manual
AXSM0055 April 2011”

just curious what you all think?

 

[capncking]

I have a 2023 Gladiator Rubicon and want to change diff fluids. I have on hand 3 qts of Amsoil 75W90 and 1 qt of 75W110.
After changing the front diff with 75w90 I wont have enough to fill the rear diff.
Will it hurt if I make up the difference with the 75w110?

 

[Hootbro]

Will it hurt if I make up the difference with the 75w110?

No it will not hurt.

DANA actually recommends on their aftermarket sold Advantek D44 axles and rebuild to use 75W-140. So use of a 75W-110 grade for top off should not hurt a thing.

I am sure some pocket protector wearing member here will say the gates of hell will open up mixing grades though.

 

[capncking]

No it will not hurt.

DANA actually recommends on their aftermarket sold Advantek D44 axles and rebuild to use 75W-140. So use of a 75W-110 grade for top off should not hurt a thing.

I am sure some pocket protector wearing member here will say the gates of hell will open up mixing grades though.

Thanks--I appreciate the quick response! I do have several qts of the 75w140 as well and will use if I end up towing

 

[ShadowsPapa]

No it will not hurt.

DANA actually recommends on their aftermarket sold Advantek D44 axles and rebuild to use 75W-140. So use of a 75W-110 grade for top off should not hurt a thing.

I am sure some pocket protector wearing member here will say the gates of hell will open up mixing grades though.

In his favor - it's hardly a jump at all, and it's not going to swing things to any extreme - and it's both amsoil. Even at that though, I used to buy the stuff bulk for my trucks and tractors, and you can bet that some viscosities got mixed.
In TX, the extra viscosity might be a good thing.

 

[JTGuy]

I am old school. I use Torco 85-140 non synthetic rated GL-6. Better than GL 5.

Sponsored