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Old 03-19-2011, 07:12 PM   #1
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Drain plug question

My wrangler ate my drivers front floor drain plug does anyone know where i could buy them? One more question going to change the oil in my front and rear differential going to use Royal Purple oem calls for 80-90 for it and royal purple only makes 75-90 and 75-145 which one could i use since they don't have 80-90. Ive asked this question a couple times before on here and haven't got an answer yet!

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Old 03-19-2011, 07:17 PM   #2
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75-90 is ok.but check to see if rear diff needs additive.

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Old 03-19-2011, 07:18 PM   #3
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First, the exact gear lube viscosity is not critical. 75W-90 is close enough to be 80W-90 for all intents and purposes. And for heavier uses, a heavier viscosity is recommended anyway. I run either Torco or Valvoline 85W-140 conventional gear lube in my axles.

Personally, I would not pay extra for Royal Purple despite all the hype surrounding it. And its purple color is just a marketing gimmick. That purple is just a short-lived dye added to the gear lube.

Actually, I won't run synthetic gear lubes in my TJ since several axle manufacturers determined the ring & pinion gears run hotter when lubricated with synthetic than they do conventional gear lube. The surprising discovery that synthetic does not extract heat as well as conventional gear lubes do has made a number of axle manufacturers to change their warranties to require conventional gear lubes, and void the warranty of any axle that comes back in for warranty work they found was loaded with a synthetic gear lube.

Quick question, does your rear axle have a Tracloc limited slip differential? If so, make sure any gear lube you buy says it is "compatible with limited slip differentials" on the back label which indicates it has the friction modifier additive that the Tracloc LSD requires.
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Old 03-19-2011, 07:52 PM   #4
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Quote:
Originally Posted by Jerry Bransford View Post
First, the exact gear lube viscosity is not critical. 75W-90 is close enough to be 80W-90 for all intents and purposes. And for heavier uses, a heavier viscosity is recommended anyway. I run either Torco or Valvoline 85W-140 conventional gear lube in my axles.

Personally, I would not pay extra for Royal Purple despite all the hype surrounding it. And its purple color is just a marketing gimmick. That purple is just a short-lived dye added to the gear lube.

Actually, I won't run synthetic gear lubes in my TJ since several axle manufacturers determined the ring & pinion gears run hotter when lubricated with synthetic than they do conventional gear lube. The surprising discovery that synthetic does not extract heat as well as conventional gear lubes do has made a number of axle manufacturers to change their warranties to require conventional gear lubes, and void the warranty of any axle that comes back in for warranty work they found was loaded with a synthetic gear lube.

Quick question, does your rear axle have a Tracloc limited slip differential? If so, make sure any gear lube you buy says it is "compatible with limited slip differentials" on the back label which indicates it has the friction modifier additive that the Tracloc LSD requires.
I do have Traclock got a 04 LJ and it does have it i already brought the additive for the tracklock and plain on using it for any gear oil i buy just to be on the safe said sure it wouldn't hurt to add it to any oil i buy. Is mobile one good for gear oil to? Also i brought a ARB differential cover for the rear/front and it comes with a dip stick and i noticed it comes with different level lines on the stick so don't wanna reply on the stick to know when its full so how many quarts do each differential take?
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Old 03-19-2011, 08:02 PM   #5
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I'm not a Mobil-1 gear lube fan, I use and prefer either Valvoline or Torco conventional gear lube. I personally would not use a synthetic gear lube as it is the belief of many gear manufacturer that the ring & pinion gears run cooler when lubricated with a conventional gear lube.

Most gear lubes already have the required friction modifier additive so I would not add more if it does. The back label will say something like "Compatible with limited slip differentials" if it already contains the required friction modifier. Only add that friction modifier additive you bought if the gear lube does not already contain it.

The ARB diff cover's upper fill line is for overfilling the normal fill hole height in case your rear driveshaft has been replaced with an aftermarket CV driveshaft. A CV driveshaft requires the axle be rotated to raise the pinion angle so the normal height fill hole becomes too low in that case. For the factory driveshaft, use the lower hole. For an aftermarket CV driveshaft, use the upper hole.

The axles take roughly 2 quarts each.
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