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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Ben_Greenberg on September 06, 2014, 07:29:03 pm

Title: Fluid in quarts needed for my rear differential
Post by: Ben_Greenberg on September 06, 2014, 07:29:03 pm

Hey guys,
Im looking to replace the gasket and fluid for my 78 GMC C15 heavy half with the 12 bolt cover. I just want to make sure I dont overfill.

The manual I have lists every option and im not sure which one ive got.

Thanks everybody!

Title: Re: Fluid in quarts needed for my rear differential
Post by: bake74 on September 06, 2014, 10:21:10 pm

     I think I understand your question. 
     The fill plug on a 12 bolt is toward the top, fill it till fluid comes out when your truck is on a level surface.  Put the plug in and your done.

Title: Re: Fluid in quarts needed for my rear differential
Post by: Ben_Greenberg on September 07, 2014, 08:44:44 am

Quote from: bake74 on September 06, 2014, 10:21:10 pm

     I think I understand your question. 
     The fill plug on a 12 bolt is toward the top, fill it till fluid comes out when your truck is on a level surface.  Put the plug in and your done.

Thanks for the quick response, I was hoping to figure out how many quarts I needed to buy. I have 3 but I don't want to be left without enough fluid while working on it.

Title: Re: Fluid in quarts needed for my rear differential
Post by: bake74 on September 07, 2014, 12:56:05 pm

      Well the manual does not say exactly how much it takes, though when I did mine I believe I had 4 quarts on hand and used just short of 4.  To be on the safe side you could always buy 2 more and return 1 if you did not use it.

Title: Re: Fluid in quarts needed for my rear differential
Post by: Ben_Greenberg on September 07, 2014, 08:13:23 pm

Sounds like a plan. Thanks for the advice!