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Old 04-12-2008, 09:50 PM   #1
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fluid change

Im gettin ready to put my sye kit in and change my rear axle pinion seal(d44)...im searching and finding mixed answers on wich type of fluids to put back in...for the the transfer case I hear ATF-3 or is it 4 for like the manual says, i heard one was bad for it? then for the for the diff gear lub 75W-90 but some say 75w-190 even with out lockers...same for the front want to change it out while im at it...thanks guys

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Old 04-12-2008, 10:07 PM   #2
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Since that are both a splash lube system the oil isn't a big concern. The tcase is fine with any atf. I like full synthetic mobel 1. I like 75w-90 for the diffs but thicker is fine too.

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flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 04-13-2008, 09:45 AM   #3
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X2 on the Mobil-1 ATF, the TC will shift much smoother into 4lo, as for synthetic into the axles, mixed on that, I switched to Mobil-1 on my 98XJ when it had about 60,000mi on it with no problems, when the auburn went into the 8.25 the auburn manual said 'No Synthetics' so I went with drydene 75-90 and friction modifier. That was in 2001.
If you have ANY seepage on the axle end seals the synthetic will get thru it even more, so if you do go syn keep an eye on the end seals for a while.
The new lockers and LSD's now say it's OK for synthetics and thats whats in the D35 on my ZJ which I just had totally rebuilt with new gears and a LSD last month, it does run cooler by feeling it with my hand. That was also true of the 231 transfer case, after 60 miles of interstate driving the the TC was hot to the touch, uncomfortable hot I might add. After driving 60 miles to the inlaws I changed the TC fluids while I was there, when we got back home I did the same touch test and the TC was much cooler, barely warm, big change IMO. It also had a slight seep on the output shaft, after about 10K that seep went away and the TC has kept all it's fluids after dumping about 2 pints during that 10K when I first changed it.
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Old 04-13-2008, 09:54 AM   #4
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I run run synthetic in my axles. And in my ax15 I run synthetic redline mt-90
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99 sahara
4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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