Rear Diff oil type. - Chevrolet Forum - Chevy Enthusiasts Forums

Rear Diff oil type.


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Beebe's Avatar
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Wisconsin

July 20th, 2009, 10:09 PM   #1  
Rear Diff oil type.

I'm planning on changing the rear diff. lube on my 2000 Silverado, and my 2005 Suburban. Both have 4 wheel drive. According to the owners manual it recommends synthectic 75W-90 oil. I went to a local parts store and they did not have 75W-90. They had 75W-140, and 80W-90. I was told by the owner of the store that the Amsoil 80W-90 will work just fine. Just wanted to get some other opinions. The oil does meet the GM requirements. Thanks.

 
suzuki-guy's Avatar
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July 20th, 2009, 10:14 PM   #2  
I used 80 90 but is it a possi unit? If it is you need the GM possi additive or you will get possi clutch chatter.

 
Beebe's Avatar
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July 20th, 2009, 10:23 PM   #3  
I don't know. How do I find out? The label on the back of the qt says it complies fith GL-5 and GM specs.

 
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July 20th, 2009, 10:36 PM   #4  
I think if you look at your RPo codes in your glovebox there should be a G80 Which is possi and you will need the GM additive!

 
MDTAHOE's Avatar
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July 21st, 2009, 6:50 AM   #5  
Jack the back of the truck up so the back wheels are off the ground. Put it in neutral spin a back wheel by hand, if the wheels go the same direction put the addative in. If one wheel goes foward and one goes backwards you do not need it.

 
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July 21st, 2009, 9:51 PM   #6  
I thought the G80 was an Eaton locking diff, not a clutch type. But I don't know when they started using it.

 
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