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Old 08-07-2010, 12:59 PM
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Changing oils

Im wondering if anyone has any guidance out there on changing diff fluids, transfer case oil, and tranny fluids for my 95 YJ? I'm picking up a Haynes manual today, but are there any lessons out there for stuff to look out for before I start opening stuff up? Thanks in advance.

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Old 08-07-2010, 06:37 PM   #2
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I've heard many folks say 10w30 in the tranny, but not sold on that.

I just did all mine 2 days ago. Used all Royal Purple, love the stuff, used it for years now.

Diffs and Tranny - 75-90 gear oil

Transfer Case - ATF

Honestly, changing these fluids is the one thing I always visit my buddy Rick's service station to do because he has a lift. It really is a PITA trying to do it on your back with a droplight, and messy too. It's worth the 30 pack Bud Light to raise it up.

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Old 08-07-2010, 06:49 PM   #3
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i have just changed my tranny and t-c and i used 80w-90 for it farily simple 4 bolts total bottom of the diff there is the drain plug and there is on the bottom left side of t-c the is also a drain plug. i drain everything then run 1 quart to flush it, plug it up and refill. should have everything in the manual
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Old 08-07-2010, 07:10 PM
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how do I know what kind of manual tranny and transfer case i have?

manual tranny could be ax-4/5,ax-15,nv1500,nv3550

transfer case Np207,231,241,242

I have a 95 YJ with a 4.0 6banger
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Old 08-07-2010, 07:11 PM
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fyi the dealer wanted $480 bucks for the engine oil, tranny, diffs, and t-c. i think ill do it myself...
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Old 08-07-2010, 07:23 PM
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also the guy at autozone said I could use ATF+4 AUTO fluid in place of manual trans fluid, is that kosher?
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Old 08-07-2010, 07:42 PM
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after a little research ive determined the YJ is either using an AX-4/5 or AX-15 which is fine they both use 3.5quarts of 75/90W GL-5

I still cant determine what type of transfer case I have though...
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Old 08-07-2010, 08:34 PM   #8
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if you have the 4.0 you have a NP 231. Not sure about the four banger though.

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Old 08-07-2010, 08:39 PM   #9
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There should be a round tag on the back of the Transfer case that has the model #.
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Old 08-07-2010, 08:44 PM   #10
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Forget the Auto-Zone guy and the dealer who doesn't work with Jeepers.

copleydad has it right. Try to get to around 75-90. Get Mobile 1 synthetic oil in that range.

Oil Education Moment:
The first number on the oil bottle is how viscous the oil is at the cold (outside temperature) state. The lower the first number, the thicker(gooey) the oil is when you crank the engine up in the morning.

The second number represents the oil viscosity at *running* temperatures.

Some engine parts need a little protection when you start the engine up - the most violent and wearing part of driving any engine. So, you want a nice thick oil to coat everything at start up.

When the engine warms up, you've got an oil coating on everything, and then you don't want a thick oil to bog down the engine and rob your Jeep of horsepower.
-------------------

Your "Diff" needs to stay as cool as possible while maintaining performance. The thicker oil is actually *cooling* the differential under load by splashing oil all around the place around the gears under you Diff cover.

Remember, we're talking about gear oil, but the same *cooling/heat* principles apply to rest of your engine. Run Mobile 1 10W-30 or Royal Purple at the same weights if you can in your engine.
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Old 08-07-2010, 08:56 PM
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so concerning the transfer case lubricant, haynes says to use ATF+4 as does some of the posters here. My question is, is it safe to use automatic transmission ATF+4 fluid in my 5speed manual trans? I cant seem to find manual ATF+4, maybe i'm not looking in the right place, or can I use 75-90 as well.

FNjeep: great info thanks, I take it you mean I can use 75-90 in the tcase? i just want to be sure I'm not using the wrong stuff.
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Old 08-07-2010, 10:06 PM   #12
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I've got to recant on my previous post a little bit. I tend to forget that I've got a Ford 8.8 in my back end and the advice for Jeeps is different.

Here's the proper info for you:
Jeep Axle Differential Fluid Change Service
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Old 08-07-2010, 10:49 PM   #13
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Everything you ever needed to know about oil can be found here: Welcome
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Old 08-07-2010, 10:59 PM
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cool site, heres more info on the tranny side

Jeep NV3550 Transmission & NP231 Transfer Case Service
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Old 08-10-2010, 07:15 PM
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OK so I just finished changing all the fluids in the YJ to include the radiator fluid, engine oil, oil filter, transmission fluid, front and rear differential fluids, front and rear gaskets (i removed the covers and really cleaned the hell out of them), transfer case fluid.

Here's a list of the fluids I used:

Royal purple 75w90 for the transmission, and both differentials (I bought 8 quarts needed about 6.5-7 quarts)

Valvoline ATF+4 for the transfer case (2 quarts)

Peak 50/50 radiator fluid

penzoil 10w30 with stp oil filter

If you change the diffs, tcase, or tranny purchase a 3 dollar bottle pump, trust me it makes your life MUCH easier, also put it on a lift if you can, changing the diffs otherwise is a pain because their bolts hide behind stuff

Changing the oil and oil filter are easy, transmission fluid has a bolt on the top and that's for filling, theres a bolt on the bottom and that's for draining. Open both, drain, clean the plug of any metal shavings (its magnetic), replace drain plug, fill with 75w90 until it drains out of the filler port. Wait till it stops flowing out, secure the other bolt bolt back in snugly (NEVER overtighten) and you are done!

Transfer case operates the same way, two plugs, fill with fluid, just make sure you dont use 75w90 use ATF+4 (consult your car manual or dealer if unsure)

When it comes to the diffs it gets a little more confusing. You'll need gasket maker, a paint scraper, brake cleaning spray, 75w90 (about 4 quarts for both diffs), and a way to jack the frame up to make the springs sag so the diff case bolts are all exposed.

unscrew all the bolts except the top one, leave it barely screwed in. Use the paint scraper to CAREFULLY separate the cover from the diff, DO NOT score the mating surfaces or you will be SOL, enough so the fluid flows out. once the cover is off, look at your gears, make sure nothing is damaged. Go ahead and spin your tires and watch the gears move. If everything looks OK, cover the gears in paper towels and CAREFULLY scrape the old gasket off the surfaces, same goes for the diff cover. once done, remove the paper towels spray brake cleaner in there watch untolds amount of goop roll out of the gears. spray the mating surfaces as well and rub dry with said papertowels, repeat on cover. Use a THIN bead of the gasket maker all along the surface of either the cover or diff, less is more in this case. Make sure to hit the whole surface but not to use too large of a bead of gasket, dont cover any bolt holes. Replace cover and retighten the bolts in a criss cross manner (do one, then do the one opposite it, NOT one after the other in a circle). refill the diff with fluid through the plug, fill until it flows out of the hole, replace the bolt, tighten it snugly never too tightly. Then dance and celebrate and move on to the other one. The site referenced above gave me all this great info and I have summarized the instructions from that site here. The author provides pictures and is more in depth than I am, i recommend checking it out.
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Old 08-10-2010, 10:55 PM   #16
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Thank you wasomma.

You have no idea how valuable the information you just posted is to Jeepers.
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Old 08-10-2010, 11:24 PM
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Quote:
Originally Posted by FNjeep View Post
Thank you wasomma.

You have no idea how valuable the information you just posted is to Jeepers.
cool man im new to all this so I feel new owners pain when they look at threads like this and wonder "am i supposed to change a differential?" Just here to help, if anyone has any questions please PM me I'll try to answer to the best of my ability.
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Old 08-18-2010, 03:12 PM   #18
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this was a huge help!!! thank you all that have contributed to the much appreciated info. YOU ROCK!!
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Old 08-18-2010, 03:17 PM   #19
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Yikes you like your tranny more than your engine? Royal purple in the tranny and pennzoil in the motor....
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Old 08-19-2010, 12:44 PM
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I couldnt get royal purple atf4. I went with mobil1 or penz, i found penz. Penz = mobil1 < royal purple/amsoil
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Old 08-19-2010, 03:55 PM   #21
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On another note that I'm sure you have figured out by now is that you have the ax-15 tranny and 231 t-case.I use 10w30 motor oil in my tranny and wheel it pretty good and never had an issue yet. If you go to the crysler site and look up the part number for the gear oil for the tranny the number matches 10w30 motor oil. There was a viscosity break down sheet floating around the internet for awhile that shows its almost the exact same across the board as the gear oil everyone recommends for the tranny.
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Old 08-19-2010, 09:00 PM
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well kind of... I took it to the dealership beforehand and talked to them about what oil to use in the jeep. 10w30 is acceptable in jeeps 98 and newer only even then its not recommended, the manual/book/chrysler book all call for 75w90 for AX-15. Wrong oil will cause wear thats not easily susceptible until it breaks.

Fluids - Lubricants - JeepForum.com Community Jeep Wiki

the debate really is when to use gl-4 and gl-5. 10w30 is for your engine, although i suppose it could work in the tranny, its not what the book calls for though.

use this:
http://www.redlineoil.com/product.aspx?pid=46&pcid=7

not 10w30
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Old 08-19-2010, 09:04 PM
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