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15-06-2009
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Established Member
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Join Date: Jun 2008
Location: Warragul
Posts: 99 What Jeep do I drive?: JK
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Below Is direct from the JK service manual. Hope this helps
I think our front diff is the 35 were the manual here says 30, this is from a US manual so maybe its different there.
AXLE LUBRICATION
NOTE: DiamlerChrysler recommends using Mopar® lubricants or lubricants of equal quality.
FRONT AXLE
186 FBI (Model 30) - Mopar® Gear Lubricant 80W-90
216 FBI (Model 44) - Mopar® Gear Lubricant 80W-90
REAR AXLE
198 RBI (Model 35) - Mopar® Gear Lubricant 80W-90 (Trailer Towing Mopar® Synthetic Gear Lubricant 75W-140)
226 RBI (Model 44) - Mopar® Gear Lubricant 80W-90 (Trailer Towing Mopar® Synthetic Gear Lubricant 75W-140)
NOTE: Trac-lok® equipped axles require 0.1 L (3.4 ounces) of Limited Slip Additive in the lubricant.
FRONT AXLE ± .03 L (1 oz.)
186 FBI (Model 30) 1.0 L (2.1 pts.)
216 RBI (Model 44) 1.3 L (2.7 pts.)
REAR AXLE ± .03 L (1 oz.)
198 RBI (Model 35) 1.83 L (3.8 pts.)
226 RBI (Model 44) 2.25 L (4.75 pts
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15-06-2009
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DetroitDemon
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Join Date: Dec 2006
Location: Adelaide
Posts: 4,851 What Jeep do I drive?: JK
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Liked 24 Times in 17 Posts
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cheers Brett. I will take another look but i reckon that is not in ours but i hope i am wrong
__________________
If you don't stand for something you will fall for anything
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15-06-2009
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Established Member
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Join Date: Jun 2008
Location: Warragul
Posts: 99 What Jeep do I drive?: JK
Likes: 0
Liked 0 Times in 0 Posts
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Wanglertj, I have the same written in my owners manual, page 221
226 RBI (Model 44) - Mopar® Gear Lubricant 80W-90 (Trailer Towing Mopar® Synthetic Gear Lubricant 75W-140)
I am sure all is ok...
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16-06-2009
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DetroitDemon
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Join Date: Dec 2006
Location: Adelaide
Posts: 4,851 What Jeep do I drive?: JK
Likes: 27
Liked 24 Times in 17 Posts
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Quote:
Originally Posted by Brett_B
Wanglertj, I have the same written in my owners manual, page 221
226 RBI (Model 44) - Mopar® Gear Lubricant 80W-90 (Trailer Towing Mopar® Synthetic Gear Lubricant 75W-140)
I am sure all is ok...
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ahhh, see theres my problem. My manual only goes to page 200. Maybe they whacked a few pages in in the later models. Thanks anyway. you guys have answered my quesstion and i didnt think i was going mad 
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If you don't stand for something you will fall for anything
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10-08-2009
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Im using a Penrite Mineral oil "Limsip 85W-140" as was filled by a Diff shop i went to last year. Its back there now as im getting them to fit another locker for me But they have just found that the ring gear is stuffed! it has a slivered piece of metal that has sheered off the size of a 1 cent piece.
This is the Front Dana 30.
Im not sure if its just a bad set of aftermarket Superior Gears or i overloaded the Diff or its the OIL?
Nowhere do i see Mineral oil recommended and now im thinking should i go with Penrite SIN GEAR 75 (75w-90) or SIN GEAR 80 (80w-140) both Fully Synthetic Oils
The Diff shop are putting in Limsip 85w-140 again saying its all they use and its better than Synthetic! I asked about putting in Limsip 90 in the Front only but again they say 85w-140 is the only one i should be using in both.
Is anyone using Mineral Oil in their Diffs???
Last edited by ShortBlack; 11-08-2009 at 09:27 AM.
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11-08-2009
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Quote:
Originally Posted by Brett_B
I am running Penrite full synthetic 80/140 in my rear diff.
I have the factory rear locker, same as the rubi but 3.73 ratio.
I have never had a problem with the locker operating cold or hot and don't expect to.
I changed to the 80/140 to follow the manual recomendation and it was time to check the diffs after some deep water crossings.
From memory the manual does state 75/140W 'full synthetic' when towing....
I do a bit of towing so like the idea of having the good stuff.
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Is this the Oil your using Sin Gear Oil 80
Are you only using it in the Rear? do you still have 80w-90 in the Front?
cheers.
Last edited by ShortBlack; 11-08-2009 at 09:19 AM.
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