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| Drivetrain Discussion on gearing, CV joints, driveshafts, axles, brakes, etc. |
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02-12-2013, 03:09 PM
| eBay Motors #1 (permalink) |
| Junior Member  Join Date: Jun 2012 Location: Murphy NC
Posts: 68
| 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
__________________ 2012 GMC 2500HD Cognito leveling kit, 275/65 20 Toyo MT on 20x9 chrome Fuel Octane wheels, trex billet grills, 5" flow pro exhaust with down pipe, mini maxx |
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02-12-2013, 10:13 PM
| eBay Motors #2 (permalink) |
| Senior Member  Join Date: Jun 2011 Location: Idaho
Posts: 256
| 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.
__________________ 2004 lb7 Cali. emissions ECLB 2500 HD. Tows 12K lb. 5th wheel. 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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02-12-2013, 11:05 PM
| eBay Motors #3 (permalink) |
| DuramaxForum Fanatic  Join Date: Nov 2009
Posts: 6,130
| 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.
__________________ Mack: LMM. |
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02-12-2013, 11:43 PM
| eBay Motors #4 (permalink) |
| Junior Member  Join Date: Sep 2012 Location: intermountain west
Posts: 233
| 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.
__________________ Currently: 2006 CCSB LBZ ~ 4" exhaust/AFE intake ~ Pyro/Boost on the a-pillar ~ EFI Live w/ dsp 5 ~ CAT fuel filter Politically Correct: A term used for whiny pu**ies that need sh*t sugar coated |
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02-13-2013, 12:20 AM
| eBay Motors #5 (permalink) | ||
| DuramaxForum Veteran  Join Date: May 2011 Location: Somewhere in TX
Posts: 1,939
| I didnt change my gear oil (for the 1st time) until I had 55-60K miles & it was very nasty.
__________________ 2009 Sierra 2500HD LMM SLE CC/SB 4x4 Stock.  Pacer LED NBS Cab lights, Putco yellow bulb Fog lights, GM Dually light bar, Footwell lights, Tinted windows, GM chrome oval Running Boards, Fumoto oil drain valve, Bilstein HD shocks, PY0 wheels, Michelin LTX M/S2 LT245/75R/16E, Rear rubber Mud Flaps, Curt Hitch class IV, Kenwood speakers, Cobra 29 CB radio, Wilson 2000 CB antenna 2011 Silverado 2500HD LML WT EC/SB 4x2 Stock. (Co. truck) Quote:
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02-13-2013, 05:16 AM
| eBay Motors #6 (permalink) |
| Junior Member  Join Date: Nov 2012 Location: Prairieville, LA
Posts: 50
| What fluid did you replace it with?
__________________ 2013 2500HD Denali anxious to start working on it   |
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02-13-2013, 05:22 AM
| eBay Motors #7 (permalink) |
| Banned Join Date: Jan 2010 Location: On the Coast of Somewhere Beautiful
Posts: 5,738
| That's completely normal... What did you replace the grape stuff with? |
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02-13-2013, 07:28 AM
| eBay Motors #8 (permalink) |
| Senior Member Join Date: Jun 2011 Location: Idaho
Posts: 256
| I used Mobil 1 synthetic 75w90
__________________ 2004 lb7 Cali. emissions ECLB 2500 HD. Tows 12K lb. 5th wheel. 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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02-13-2013, 07:59 AM
| eBay Motors #9 (permalink) |
| Junior Member  Join Date: Nov 2012 Location: Texas
Posts: 59
| Changed mine last week at 55k ... Smelled horrible!
__________________ 2009 GMC Sierra LMM SLT CCSB Z71 4X4 Stock. Ranch Hand bumpers  |
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02-13-2013, 08:23 AM
| eBay Motors #10 (permalink) |
| Senior Member Join Date: Nov 2011 Location: NorCal
Posts: 625
| 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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