Default Gear oil weight 

Old 06-18-2019, 02:10 AM   #1
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The FSM calls for 85W-90 for the diffs, tranny, and transfer, I double checked this yesterday to be sure. I have to go by the parts store today to get a head gasket and head bolts for my son's car (a whole separate story here). Would it make a huge difference if I put 80W-90 in instead?

I can get a 5 gallon jug of 80W-90 for 40 vice paying over 60 for a 5 gallon jug of 85W-90 that they have to special order. Matter of fact, my local parts guy looked at me funny when I told him 85W-90 was called for.
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Last edited by Scout1067; 06-18-2019 at 02:11 AM.. Reason: fixing fat-fingered misspellings

 

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Default Re: Gear oil weight 

Old 06-18-2019, 06:40 AM   #2
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i dont think it makes a huge difference, i am using 75-90 Mobil full synthetic in my axles and transfer case
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Default Re: Gear oil weight 

Old 06-18-2019, 09:18 AM   #3
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No difference at all.
If you run a clutch type LSD diff-get the friction modifier additive for that diff
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Default Re: Gear oil weight 

Old 06-18-2019, 11:33 AM   #4
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Default Re: Gear oil weight 

Old 06-18-2019, 11:46 AM   #5
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I kind of figured 80W-90 would be ok. Just wanted to be sure

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