GM Drivetrain & Suspension Chassis | Transmission| Driveshaft | Gears/Rear End/Differential | Traction Aids

What weight rear end fluid do I use?

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Old Feb 13, 2008 | 11:15 AM
  #1  
redsilverado05's Avatar
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From: Perry FL
Default What weight rear end fluid do I use?

I'm about to order some rear end fluid for my truck and I wanna know what weight to use and do I need to buy any type of special addative for the G80 so it still some what lock up? I'm going with Royal Purple by the way.
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Old Feb 13, 2008 | 11:55 AM
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75W-90 should do it, IIRC...no additive needed for the G80.
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Old Feb 13, 2008 | 02:37 PM
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75w90 is correct
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Old Feb 13, 2008 | 06:40 PM
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The rear diff is synthetic from the factory, and no additive is needed for the G80. (75-90 as mentioned above)
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