LOOK....LML Gear oil Change - Chevy and GMC Duramax Diesel Forum
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Old 02-12-2013, 03:09 PM   eBay Motors  #1 (permalink)
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LOOK....LML Gear oil Change

well i changed my rear diff gear oil today after thinking about it for the last couple months. i dont know if this is normal but made me very happy i changed the oil and makes me wish i had listened to others on here and done it sooner. both of the magnet plugs had this on them and thats only half of the stuff on one plug on my finger in the picture

if you are one reading this like me putting it off changing yours do it now. my truck is only at 15k
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Old 02-12-2013, 10:13 PM   eBay Motors  #2 (permalink)
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When the lb7's first came out GM was recommending changing out rear axle fluid after first 500 miles (yes five hundred). So many people complained about this that they just dropped the recommendation. This is according to the dealer I bought mine from, who told me to do it. I did it at 500 and again at 50,000, and the magnet was noticeably cleaner the second time.
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Old 02-12-2013, 11:05 PM   eBay Motors  #3 (permalink)
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New gears seem to leave a lot on the magnet. I guess its just getting them broken in? Mine hasn't had a thing on the magnet since my first gear oil change..yes the magnet is still there.
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Old 02-12-2013, 11:43 PM   eBay Motors  #4 (permalink)
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When I setup new gears I run em for 500-700 miles and then change fluid. Its always got crap in it. The gears break into each other.
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Old 02-13-2013, 12:20 AM   eBay Motors  #5 (permalink)
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I didnt change my gear oil (for the 1st time) until I had 55-60K miles & it was very nasty.
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Old 02-13-2013, 05:16 AM   eBay Motors  #6 (permalink)
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What fluid did you replace it with?
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Old 02-13-2013, 05:22 AM   eBay Motors  #7 (permalink)
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That's completely normal...

What did you replace the grape stuff with?
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Old 02-13-2013, 07:28 AM   eBay Motors  #8 (permalink)
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I used Mobil 1 synthetic 75w90
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Injectors replaced at 49K miles (Jan. 2012).
EFI Live by Idaho Rob with Edge Insight CTS and pyro.
Fumoto drain valve and stainless bleeder screw from Merchant.
Bilstein 5100's from Norcal Nick.
Prodigy P3 brake controller.
Transynd, Mobil Delvac and Stanadyne PF.
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Old 02-13-2013, 07:59 AM   eBay Motors  #9 (permalink)
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Changed mine last week at 55k ... Smelled horrible!
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Old 02-13-2013, 08:23 AM   eBay Motors  #10 (permalink)
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Changed mine to Mobile1 at 2500mi and it looked pretty much the same. Every vehicle I have owned I haved changed out the diff oil early with similar results. Dont know why all manufacterers recommend waiting 10s of thousands of mi. before changing out the first time.
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