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Old 07-10-2012, 06:01 PM   #1
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Doing front/rear diff fluids this weekend

Like the title says, I'm going to get under the jeep this weekend and change my front and rear diff fluid. My rig- 99 sport with a 4.0 and a 5-speed. Few questions.

1) what fluid should I use? Brand?

2) what sealant should I use when I put the covers back on?

3) I don't have a lift or jack stands. I have a 2" BB, so do you guys think I'll be able to just crawl around under there and make it work? It seems tight in the rear with the gas tank, that's my main concern.

4) any other helpful tips/tricks?

Thanks fellas

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Old 07-10-2012, 06:55 PM   #2
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Well the fluid is eithier a 75w-140 80w-90 and brand of fluid i personaly use pennzoil gear fluid and when i did cherokee i used rtv gasket maker in the black tube

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Old 07-10-2012, 07:06 PM   #3
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I don't use any special kind of fluid...just whatever the auto store has cheap has always worked for me...just check the weights. Dont bother with synthetic in the diffs unless you NEED it (my 8.8 calls for it due to the factory POSI) I have actually read that synthetic gear oil retains more heat than dino oil. I also use black RTV for the "gasket." You should have enough room to change fluid without jacking it up. As long as you can get the cover off (shouldnt be an issue) to drain it, and can get a bottle back to the fill plug (also should be good) you'll be good. Dont worry much...its an easy job
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Old 07-10-2012, 07:25 PM   #4
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Also just a hint but u can get some hose that will fit on the end of the nipple on the bottle, and squeeze the bottle from out from under the jeep gives you more room kinda like a funnel, just fyi
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Old 07-10-2012, 07:28 PM   #5
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The easiest way is to buy a $7 fluid pump just stick it in and pump it out. You will get almost all of it out. The best part is the refill is easy. If you don't use a pump it is really hard to fill.
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Old 07-10-2012, 07:30 PM   #6
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Leave a Bolt or 2 Threaded in a lil Bit on each Cover when you are ready to Pry them Off, so they don't come completely Off and Fall in your Catch Pan then you have to Dig it out of an Oily Mess.

IMO, I'd Use the Lube Locker Gaskets. They are Re-Usable.
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Old 07-10-2012, 07:41 PM   #7
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Nearly any GL-5 gear lube is fine for your axles, within reason the exact viscosity is not critical. 75W-90 is fine most of the time, go with something a little heavier like 80W-120, 85W-140 etc. if you tow a trailer. I personally choose to use a conventional gear lube, not a synthetic in my axles. Tests have shown the gears run cooler when bathed in conventional than when they are bathed in synthetic. In fact, many custom axle builders like Currie require a conventional gear lube to maintain the warranty.

On the sealant, Permatex RTV is what you want. There are lots of colors but when I used RTV, I always used Permatex Ultra Black which never leaked. Permatex has a new RTV that is specifically meant for sealing differentials since it better resists the harsh GL-5 gear lube used in them. I think they just call it RTV Gear Lube.
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Old 07-10-2012, 07:44 PM   #8
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Old 07-10-2012, 07:56 PM   #9
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Thanks for all the advice guys, that's why I love this forum. Post a question and have 6 responses in no time. I'm not too concerned about it, I figured this would be a very simple thing to do to get my feet when underneath the jeep... Next step? Replacing the gas tank skid plate.

When the guys at Valvoline told me it would be $150 because my diffs only accepted synthetic, I laughed and drove off.

Last question (for this post) How much do I need?
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Old 07-10-2012, 08:11 PM   #10
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3 qts should do it but I always buy the gallon so I have some extra laying around just incase
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Old 07-10-2012, 08:12 PM   #11
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They hold a little over 2 quarts so for two axles, 5 quarts will be enough.
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Old 07-11-2012, 01:58 AM   #12
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Jerry for which differentials are those?

I have a D30 and D44 and together they used just more than 3Litres/3 quarts for the both of them. I bought 3.5litres just to be sure but used virtually none of it the extra 500ml.

I changed my diff fluids with only a 2" BB fitted. The rear is a little tight but should be no problem. Can I suggest not prying the covers off as another poster suggested. Leave one or two bolts a little threaded and then tap the side of the cover with a rubber mallet - you won't believe how well this works.

I use WM. Penn 85W140 and some black RTV and brake cleaner to clean the inside once the gear oil is drained.

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