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Unread 12-23-2013, 12:17 AM   #1
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1998 TJ Wrangler 
Join Date: Jun 2011
Location: sacramento, ca
Posts: 90
G2 dana 44 break-in question

So i changed my gear oil at the 500 mile break-in. I'm not sure if something is wrong or this is normal but the fluid I removed from the axle was grey with what I am assuming is metal shavings from everything seating into the brand new axle housing, gears and ARB locker. I have not yet been able to test the locker however there isn't a single noise or anything coming from the axle. Nice and smooth with no issues.

So is the grey gear oil something I should be worried about?

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Unread 12-23-2013, 06:40 AM   #2
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1986 MJ Comanche 
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most companies put a moly base of some sort on their ring and pinions, so that grey your seeing in the fluid is more then likely the grease they put on from the factory.
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Unread 12-23-2013, 09:35 AM   #3
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2000 TJ Wrangler 
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Sounds about right, but if you are really worried about it, give them a call at G2 and see what they say.
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Unread 12-23-2013, 12:47 PM   #4
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2001 TJ Wrangler 
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Location: Atlanta, GA
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Also it could be a shipping lubricant/ coating that when mixed up with the oil and heat caused a funky color.

My standard USA gears as well as Yukon gears I have used in the past seem to tint the gear oil but not nearly as bad as you are describing. It must be the pre coating of the gears and or locker.

You should have a good amount of silver metal flakes in the oil when you change it at 500 miles. I use a cheap gear oil and a couple of cheap tooth bushes to clean and get most of the flakes out, spray with a little cleaner, relube / coat with cheap gear oil and clean the bottom of the diff with a shop rag and then fill her up with your gear oil of choice!
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Unread 12-23-2013, 01:17 PM   #5
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1997 TJ Wrangler 
Join Date: Aug 2010
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I have had two gear changing (4:88 and 4:56) and both had a metallic look to the fluid coming out (dark gray) after the 500ish miles.
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Unread 12-23-2013, 01:35 PM   #6
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1998 TJ Wrangler 
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When I changed the fluid in my G2 44 at 500 miles it was also greyish. Pretty common on new parts.

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