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Unread 02-15-2014, 12:32 AM   #1
BrandonYJReed
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8.8 Gear Oil Question

For those of you guys running 8.8's in a stock wheelbase jeep, how much gear oil do you put in your rear? I ask because in most of our cases we have a higher than average pinion angle. So I wasn't sure if the stock 8.8 spec would be enough fluid to lube the pinion well enough cause it being higher. Any opinions? How much do you guys run? And any preference on weigh/brand? And I also have a L/S, do you run the oil with friction modifier or add your own?

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Unread 02-15-2014, 12:56 AM   #2
Anticanman
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I use this stuff



Fill it through the abs hole in the top til it comes out the fill hole in the solid cover. Then I give it two more pumps and call it good.
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Unread 02-15-2014, 04:15 AM   #3
jason280
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Quote:
I ask because in most of our cases we have a higher than average pinion angle. So I wasn't sure if the stock 8.8 spec would be enough fluid to lube the pinion well enough cause it being higher. Any opinions? How much do you guys run? And any preference on weigh/brand? And I also have a L/S, do you run the oil with friction modifier or add your own?
I think the FSM calls for around 2.2 quarts of 75-90 plus roughly 4 oz of friction modifier for the the LSD, at least if memory serves me correctly. I've only run one 8.8 with the LSD, but I did add the friction modifier when I added gear oil (picked up whatever Advance sold at the time). As far as adding "more" due to the increased pinion angle in Jeeps, I never have. I spoke with one of the more well-known 8.8 builders here on the east coast, and they told me there is no reason to run more than what is recommended in the FSM....the axle, even with the increased angle, is still able to fully lubricate the pinion gear. I know some people on the forum have run a lot more, so much so they have overflow issues through the vent tubing, but not me.
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Unread 02-15-2014, 06:05 AM   #4
Louie4
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Quote:
Originally Posted by Anticanman View Post
I use this stuff
Fill it through the abs hole in the top til it comes out the fill hole in the solid cover. Then I give it two more pumps and call it good.
I use 80W-90 as well, minus the friction additive. I usually get the cheapest stuff at the parts store.
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Unread 02-15-2014, 11:45 AM   #5
BrandonYJReed
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Quote:
Originally Posted by Anticanman
I use this stuff Fill it through the abs hole in the top til it comes out the fill hole in the solid cover. Then I give it two more pumps and call it good.
Last time I filled it that much it started leaking out of the top of my vent hose when I would drive around.
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-1999 XJ, 4.0, AW4, lifted 4.5", JK Rubi take offs.
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Unread 02-15-2014, 12:55 PM   #6
jamnjeep
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I typically put around 4 quarts in my 8.8 (22 degree pinion with SOLID diff cover). Oil still not close to the stock fill plug and have not had any issues with oil spitting out. I have found that using 75-140w keeps the locker quieter also.
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Unread 02-15-2014, 05:53 PM   #7
Anticanman
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Originally Posted by BrandonYJReed View Post
Last time I filled it that much it started leaking out of the top of my vent hose when I would drive around.
Catch can will fix that
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