Which Rear Diff fluid do I need?

[Dusty Dude]

@SadRobot
whatever you do, don't get this shit in your hair!

Flashback to the 50’s!

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[etoften]

Valvoline sells gear oil in 1 qt bags that a lot of people like to use. They make it easier to get the fluid into the differential.

I end up using pumps with hoses that I've had forever. They work great with gallon jugs.

These! I have a different one for every flavor of gear lube in the garage. Pro tip. Ihave had good luck getting them for free from any place that services outboard engines. One usually comes with every cases of lower unit gear oil. They usually have more coming in than going out.

 

[gatorboy]

These! I have a different one for every flavor of gear lube in the garage. Pro tip. Ihave had good luck getting them for free from any place that services outboard engines. One usually comes with every cases of lower unit gear oil. They usually have more coming in than going out.

I have a 22 Mojave. Don’t need limited slip additive in rear, since their e lockers, but what about the front? Their not lockers but do I need the additive in the front?

 

[YJdude]

Thanks, do you happen to know the required torque specs for the bolts on the cover?

I believe your '22 has drain plugs on each axle? My '21 has them, which I appreciate since I have the LSD, which gets nasty quickly. They stopped doing that in 22 or 23 I believe.

 

[UTME]

I just replaced front and rear. Used valvoline 75W-140. The squeeze packs are easy to deal with. Good price on Amazon. Used almost 3 of them.

 

[DannyPhl]

Big thanks to everyone for the help! I was able to get the fluid changed with no issues. Went with 75W-90 (Purple). My 2022 doesn’t have the front drain plugs, and getting a few of those top-right bolts out was a pain—but it’s done. No leaks so far. You guys are awesome!

 

[mtn-hiker]

Did you end up putting 75w90 in both F&R?

My 19 has anti-spin (M220) Dana 44 in the rear. The manual says 75w85 for front and rear, so I guess, 75w90 is fine in both? Where do we find the additive and how much of it should I add? Thanks!!!

 

[Rhinebeck01]

Did you end up putting 75w90 in both F&R?

My 19 has anti-spin (M220) Dana 44 in the rear. The manual says 75w85 for front and rear, so I guess, 75w90 is fine in both? Where do we find the additive and how much of it should I add? Thanks!!!

@mtn-hiker

Suggest you use 75/140 in both the front and rear diffs... No additional additive needed if you use Valvoline Flexfill SAE 75W-140 Full Synthetic Gear Oil mentioned below that has additive in it.

Read here why...
https://www.jlwranglerforums.com/forum/threads/differential-oil.147655/post-3076808

Hint: Buy squeezable pouches of 75/140, not squeeze bottles/bottles.

You'll need 3 pouches on hand in order to do both front and rear diffs on your JL.

Price Alert.... For Limited Time - Amazon is selling for $56.47 for a case of 4

WOW $14.12 per bag !

Valvoline Flexfill SAE 75W-140 Full Synthetic Gear Oil 1 QT, Case of 4
https://www.amazon.com/Valvoline-Fl...B5LTJM&ref_=pd_bap_d_grid_rp_0_25_nped_t&th=1

.

 

[mtn-hiker]

@mtn-hiker

Suggest you use 75/140 in both the front and rear diffs... No additional additive needed if you use Valvoline Flexfill SAE 75W-140 Full Synthetic Gear Oil mentioned below that has additive in it.

Read here why...
https://www.jlwranglerforums.com/forum/threads/differential-oil.147655/post-3076808

Hint: Buy squeezable pouches of 75/140, not squeeze bottles/bottles.

You'll need 3 pouches on hand in order to do both front and rear diffs on your JL.

Price Alert.... For Limited Time - Amazon is selling for $56.47 for a case of 4

WOW $14.12 per bag !

Valvoline Flexfill SAE 75W-140 Full Synthetic Gear Oil 1 QT, Case of 4
https://www.amazon.com/Valvoline-Fl...B5LTJM&ref_=pd_bap_d_grid_rp_0_25_nped_t&th=1

.

thank you!

 

[grimmjeeper]

Did you end up putting 75w90 in both F&R?

My 19 has anti-spin (M220) Dana 44 in the rear. The manual says 75w85 for front and rear, so I guess, 75w90 is fine in both? Where do we find the additive and how much of it should I add? Thanks!!!

Jeep says to use 75w85 or 75w90 so they can get 0.01MPG better during testing and EPA certification, and they don't care about it wearing out after the warranty expires. Dana (the manufacturer of the axle) recommends 75w140. Pretty much everyone recognizes that the heavier oil is needed. So go with the 75w140. And synthetic is better.

Most synthetics have the friction modifier mixed in. A few don't. It should be on the label. If you manage to find one without, you can get a small bottle at most auto parts stores. Read the label and follow the directions.

 

[mtn-hiker]

Jeep says to use 75w85 or 75w90 so they can get 0.01MPG better during testing and EPA certification, and they don't care about it wearing out after the warranty expires. Dana (the manufacturer of the axle) recommends 75w140. Pretty much everyone recognizes that the heavier oil is needed. So go with the 75w140. And synthetic is better.

Most synthetics have the friction modifier mixed in. A few don't. It should be on the label. If you manage to find one without, you can get a small bottle at most auto parts stores. Read the label and follow the directions.

Thank you, @grimmjeeper Much appreciated! I already ordered from Amazon based on the post @Rhinebeck01 posted.

 

[ArmyRN]

If you have a TrueTrac, you want pure Dino oil. No synthetic, no additives.

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