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Old 07-24-2013, 08:41 AM   #1
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What diff fluid so you guys suggest?

I'm just waiting to receive my LubeLockers so I can install them. What brand and weight fluid do you guys suggest for front and rear? I currently DD my Jeep with almost no offroading.

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Old 07-24-2013, 09:07 AM   #2
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Since you dont do any offroading, and assuming you dont do any towing, any quality 80-90wt should be fine.

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Old 07-24-2013, 09:09 AM   #3
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We only use Castrol 75/90w synthetic
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Old 07-24-2013, 09:12 AM   #4
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Are you changing front and rear?
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Old 07-24-2013, 09:13 AM   #5
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We only use Castrol 75/90w synthetic
Would you recommend the royal purple 75/90? Also, when refilling should I stop once the fluid starts coming out of the fill hole or is there a specific amount that should be poured in?
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Old 07-24-2013, 09:13 AM   #6
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Are you changing front and rear?
Yeah
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Old 07-24-2013, 09:17 AM   #7
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Originally Posted by TrueBlueJK View Post

Would you recommend the royal purple 75/90? Also, when refilling should I stop once the fluid starts coming out of the fill hole or is there a specific amount that should be poured in?
Royal purple is great too, with stock diff covers, fill until it starts to run out the full hole.
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Old 07-24-2013, 09:17 AM   #8
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Front requires 1.35 and rear 2.37 when I did mine last week I let drain for a while and only could fit 1 up front and 2 in rear. Your gonna need a pump bottle would help and you could use one from a old soap bottle and some tube. I used valvoline I think it was 75/140 front and red because I tow and offroad
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Old 07-24-2013, 09:27 AM   #9
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I swear by royal purple !
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Old 07-24-2013, 09:37 AM   #10
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I swear by royal purple !
Awesome! One more question, is the same weight used front and rear?
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Old 07-24-2013, 09:41 AM   #11
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Depends on if you tow, if you do then you want use same in both 75w-140 if not then use this in rear and 80w-90 in front
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Old 07-24-2013, 09:44 AM   #12
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Front requires 1.35 and rear 2.37 when I did mine last week I let drain for a while and only could fit 1 up front and 2 in rear. Your gonna need a pump bottle would help and you could use one from a old soap bottle and some tube. I used valvoline I think it was 75/140 front and red because I tow and offroad
Same here... just did mine last night in our 2011 JKU Sport. Just under 1 qt up front and just under 2 in back.

I used Mobil 1 75W-90 in front and 74W-140 in back because I tow. I couldn't find a definative answer on whether I needed the Mopar limited slip fluid in my TracLoc rear diff when using the Mobile 1, so I put it in anyway...

Also, I did not need a pump, but I have a 2"-3" lift too, so that probably helps.
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Old 07-24-2013, 09:47 AM   #13
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Same here... just did mine last night in our 2011 JKU Sport. Just under 1 qt up front and just under 2 in back.

I used Mobil 1 75W-90 in front and 74W-140 in back because I tow. I couldn't find a difinative answer on whether I needed the Mopar limited slip fluid in my TracLoc rear diff when using the Mobile 1, so I put it in anyway...

Also, I did not need a pump, but I have a 2" lift too, so that probably helps.
If the gear oil you're putting in has a LSD additive then you're golden. If not, you need to add the friction modifier additive. If you don't have a LSD then you can use plain old gear oil.
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Old 07-24-2013, 09:59 AM   #14
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Depends on if you tow, if you do then you want use same in both 75w-140 if not then use this in rear and 80w-90 in front
Correction, Jeep only calls for 140 in rear if you tow and always calls for 80-90 in front. I used royal purple 75-90 in front and 75-140 in rear with LSD.
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Old 07-24-2013, 10:02 AM   #15
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If the gear oil you're putting in has a LSD additive then you're golden. If not, you need to add the friction modifier additive. If you don't have a LSD then you can use plain old gear oil.
That was one version I read, and I also read that if you can add the Mopar modifer for "optimal" performance... so I poured it in anyway.
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Old 07-24-2013, 10:14 AM   #16
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Originally Posted by BacaraJKU View Post

Correction, Jeep only calls for 140 in rear if you tow and always calls for 80-90 in front. I used royal purple 75-90 in front and 75-140 in rear with LSD.
I thought the manual says 140 always in rear and 80-90 in front if you don't tow. And 140 up front if you do
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Old 07-24-2013, 10:34 AM   #17
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That was one version I read, and I also read that if you can add the Mopar modifer for "optimal" performance... so I poured it in anyway.
I don't think it'd hurt to add extra friction modifier. But name brand gear oil that's marked as having the modifier should more than suffice. I've used Redline in the past in other vehicles, then changed to Neo Synthetic which I absolutely love and will be going with in my Jeep.
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Old 07-24-2013, 10:50 AM   #18
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Here is what my OM states about it diff fluid weights.
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Old 07-24-2013, 02:15 PM   #19
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Blue Bottle Valvoline Dura Blend 85W-140. It works for Everything. Doesnt matter if towing or not, doesnt matter is LSD trac lock or not. Doesnt matter if hot or cold.

Get 4 qts and your good.

I do about 14-20 diffs a month personally. I use generic for initial break in till the 250-500mile mark, then the blue bottle valv after that. I can recommend it to every customer and cant go wrong.

Dont waste your money on lucas, redline, amsoil, etc. UNLESS you are under extreme conditions, like a true car car, towing over max rated veh tow capacity, etc...
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Old 07-24-2013, 03:00 PM   #20
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Blue Bottle Valvoline Dura Blend 85W-140. It works for Everything. Doesnt matter if towing or not, doesnt matter is LSD trac lock or not. Doesnt matter if hot or cold.

Get 4 qts and your good.

I do about 14-20 diffs a month personally. I use generic for initial break in till the 250-500mile mark, then the blue bottle valv after that. I can recommend it to every customer and cant go wrong.

Dont waste your money on lucas, redline, amsoil, etc. UNLESS you are under extreme conditions, like a true car car, towing over max rated veh tow capacity, etc...
Are you recommending that for the front diff as well?
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Old 07-24-2013, 03:41 PM   #21
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Are you recommending that for the front diff as well?
Yes. Any light duty (1 ton and down) application.
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Old 07-24-2013, 04:26 PM   #22
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I have no opinion on what fluid is better, etc except for my opinion on what I chose for my diffs. If you are concerned about diff fluid, follow what owners manual states and that is as follows:

On my 2012 JKU Sport: 80-90 front and rear if you are not towing. 80-90 front and 75-140 rear if you are towing. Ensure if you have LSD that you add modifier or get a gear oil with modifier in it.

Simple as that because everyone has an opinion.
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Old 07-25-2013, 09:23 PM   #23
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I'm pretty obsessive about maintenance and fluids. I use Kendall 80w-90 in front and rear (like the manual says) plus Mopar LS fluid in the rear (if you have LSD). Kendall is available in bulk off of Amazon, free shipping for Prime members.... if that helps you.... And the bulk package gives you enough for quite a few changes.

Edit: Also, the rear fluid was black after 3000 miles. The front fluid was amber and brand new. Front fluid wear seems to depend on usage of 4WD, which I never have used. I won't be changing the front again for quite a while (50K?).
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Old 08-11-2013, 11:01 AM   #24
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If I only occasionally tow, should I still but 140 in the rear?
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Old 08-11-2013, 11:10 AM   #25
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If I only occasionally tow, should I still but 140 in the rear?
I was in the same boat, I went ahead with 140 since I'm in AZ and figured it can't hurt.
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Old 09-10-2013, 05:17 PM   #26
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Why not just use the MOPAR Gear & Axle Lubricant SAE 80W-90 as the manual calls for?
MOPAR 4874468 - MOPAR® Gear & Axle Lubricant SAE 80W-90 for 07-14 Jeep® Wrangler & Wrangler Unlimited JK with Dana 30 or Dana 44 Axles - Quadratec

Is the Valvoline that much better?
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Old 09-10-2013, 05:25 PM   #27
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I doubt the valvoline is better, its just at every autoparts store, and its a good quality diff oil.

I will say if you asked what is better.
Walmart Magtech 80-90 and I will change it every 20K miles (about 15$ for a gal and enough to do both diffs).
OR
Mopar or Redline or Royal Purple, in any high end synth, and change it at like 70K as I think the owners man recommends (at 60-70$ for 4 qts).

I would tell you the generic.

But why not just do a common sense quality oil (val, lucas, etc) and change it at 20-30K and Know that your doing what you can to make your diff last...

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