Maintenance Info/Suggestions For New Owners - Page 2 - Chevy and GMC Duramax Diesel Forum
Maintenance Discuss scheduled maintenace, capacities, filter part numbers, etc.

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post #11 of 17 (permalink) Old 09-23-2019, 09:33 PM
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If I remember correctly, if I have a G80 rear diff, I do not use anything with limited slip additives in it, correct? Just straight Synthetic (75W90 or something like that)

2008 Silverado 2500 Crew Cab Z71
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post #12 of 17 (permalink) Old 09-24-2019, 01:33 AM
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Actually the G80 differential has clutches like a positrac and is also a locker. That gives you the smooth operation of a clutch system as well as the extra traction of a locker. GM specifies a particular synthetic fluid for this rear end. According to several sources it already has a friction modifier in it. If you want to use another synthetic gear oil it would probably be okay as long as you use a friction modifier with it.

Don't overfill the differential. There are some youtube videos where Gale Banks does testing on differential covers and oil levels. The greater risk is that too much oil will lead to greater aeration and less lube. After watching those videos I've decided that lower oil levels are better than higher ones.


Last edited by mizterwizard; 09-24-2019 at 01:46 AM.
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post #13 of 17 (permalink) Old 09-24-2019, 07:44 AM
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And if the vent becomes restricted, 4 qts instead of 3.5 qts can blow thru the axle seals too.

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post #14 of 17 (permalink) Old 09-24-2019, 11:02 PM
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Grateful for the info, thank you. What do you run in yours?

2008 Silverado 2500 Crew Cab Z71
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post #15 of 17 (permalink) Old 09-24-2019, 11:46 PM
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Mob-1 or Schaeffer's.
4-qts of Schaeffer's on the shelf now, waiting to go in, maybe this weekend.

2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air

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post #16 of 17 (permalink) Old 09-25-2019, 03:35 AM Thread Starter
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Mobile 1, can't find Schaeffers locally

2008 Silverado 2500HD CCSB LTZ Diesel
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post #17 of 17 (permalink) Old 10-03-2019, 01:57 PM
 
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Good post. Oil has been changed, fuel filter has been changed, water sensor has been changed, new batteries and repairs to the RH fender due to acid eating away the battery tray and fender bracket, all good now. Thinking about dropping the pan and changing both filters and fluid. I have a year to make this truck new again and I'm off to a good start. I like the idea of an oil cooler and changing the brake and power steering fluid.

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