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Old 10-16-2008, 03:16 PM   #1
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want to make sure i'm using the right fluids...

i just picked up my jeep a couple weeks ago and haven't had the time yet, but this weekend i'm going to replace the drivetrain fluids... engine, trans, xfer, diffs. after searching and searching on here and other forums (i don't like to ask repeat questions) i think i've narrowed it down but i want to make sure i get everything right on the first trip to the auto parts store, and the right amount.

my jeep didn't come with an instruction manual, but a haynes/chilton and/or fsm is in the near future. since i have nothing yet, i'm going into this blind.

my ride:
2000 sport
5-speed
dana 35/30, not sure if lsd yet

this is what i've been able to find so far...

transmission: i believe i have a NV3550. synchromesh, 2L. i've seen pennzoil mentioned on here, but i'm sure there are others.

transfer case: not sure what model... but use ATF +4. don't know the quantity

diffs: 3 QT 80W 90 GL-5. if it has tracloc then don't get friction modifier. if it doesn't have tracloc, add friction modifier if diffs have lsd

the engine i'm ok with, i've just never changed transfer case or diff fluid before so i didn't know what to use. i would never have thought to use atf in the xfer case

so....

1) do i have the types of fluid for each right?

2) do i have the quantity of each right?

thanks...

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Old 10-16-2008, 04:24 PM   #2
Knows a couple things...

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The transfer case (all TJs have the NV-231 aka NP-231) is not fussy in the least about the type of ATF it gets, you can use ATF+3, ATF+4, Mercon, etc. Your owner's manual only specfies ATF+4 for it because that is what is also recommended for the automatic transmission for that year... they just match the ATF types. And the Wrangler's 231 t-case is chain driven, which is why it uses ATF. Other transfer cases are gear driven so they use gear lube.

Synchromesh from GM or Penzoil is fine in your NV3550, that is a non-synthetic. If you want a synthetic, you can run Royal Purple Synchromax in it.

Just about any GL-5 gear lube you can find on the store shelf will already have the friction modifier required by a Tracloc. That additive is good for axles without Tracloc so the manufacturers put the additive into most GL-5 gear lubes. If it says something like "Compatible with limited slip differentials" somewhere on the back label, it has the additive. Don't add more additive if the GL-5 gear lube you bought says it is compatible with limited slip differentials. I would not use a synthetic in the axles, it has recently been determined by a number of axle manufactures that a traditional mineral-based gear lube helps the gears run cooler. Some of the axle manufacturers like Currie have begun requiring the use of non-synthetic gear lubes to keep their warranties in effect. Use of a synthetic would void their warranty. They were curious since axles filled with synthetic gear lubes measured cooler externally so they thought the gears were too. But with more failures than were expected, they found that the gears themselves were running hotter because the synthetic wasn't pulling (sinking) the heat out of the gears as well as a mineral-based gear lube did. That's why the synthetic gear lube itself was cooler, but not the gears it was supposed to be protecting. Surprising, but that's what they found.

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Old 10-16-2008, 04:52 PM   #3
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Remember to remove the fill plugs FIRST before you drain it. If you can't get the fill plugs out don't drain it..
When you do the diffs, leave a bolt or two in at the top while you pry the cover off, this will keep the cover from letting go and splashing lube all over you.
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