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Old 05-12-2007, 03:07 PM   #1
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diff fluid

I want to change the oil in my diffs.I have 75-90 full synthetic just laying around can I use this instead of 80w-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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Old 05-12-2007, 04:06 PM   #2
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Absolutely, that will work perfectly well. Our differentials aren't all that fussy about their viscosities anyway, and your 75W-90 is so close to 80W-90 that the difference is negligible.

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Old 05-12-2007, 06:08 PM   #3
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cool.
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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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Old 05-12-2007, 08:36 PM   #4
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No to steal the thread, but my rear diff (D35) has a factory limited slip and gets some type of additive. Anyone know what the additive is and where to get it?
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Old 05-12-2007, 08:44 PM   #5
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most fluids already come with the addetive already in, but you can get it at any marjor parts store, should be right next to the gear oil.
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Old 05-12-2007, 09:07 PM   #6
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Quote:
Originally Posted by AzTJ View Post
most fluids already come with the addetive already in, but you can get it at any marjor parts store, should be right next to the gear oil.
He would have a hard time finding a gear lube on the store shelves that didn't already have the additive.

To confirm the additive's presence, look on the back label for something like "Compatible with limited slip differentials". If it has that on the label, don't add any more additive.
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Old 05-13-2007, 02:26 PM   #7
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Well I just cracked open my d35 and the oil was the color of the road. The first owner wasn't very nice to the diff's .There is a layer of black all over the carrier and sludge in the bottom.
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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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Old 05-13-2007, 02:45 PM   #8
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The oil also smelt burnt.
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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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Old 05-13-2007, 04:18 PM   #9
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should clean it all out before refilling it.
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Old 05-13-2007, 04:22 PM   #10
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Ya i just did and I sand blasted the cover and i'm painting it now.

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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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