Gear oil rear diff
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My Backpack Gots Jets
Joined: Sep 2011
Posts: 365
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From: LBC
Gear oil rear diff
ok developed a leak in the rear end on my EX. going to fix it. was looking at the local auto parts store and they have 85/140 wt oil. is that ok to use or do i have to stick to 75/140?
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
Mobil one comes with modifier and without, make sure you read the bottle. Personally I would use it without and add a little pure modifier until the clutch chatter goes away on the circle test which would give you the optimal clutch functionality and slipping action. Depending on the clutch condition you might net even need it, or not much. I believe any of the top brands will work, and I am assuming you have a LS rear end, otherwise you are just wasting your money on modifier.
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My Backpack Gots Jets
Joined: Sep 2011
Posts: 365
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From: LBC
Mobil one comes with modifier and without, make sure you read the bottle. Personally I would use it without and add a little pure modifier until the clutch chatter goes away on the circle test which would give you the optimal clutch functionality and slipping action. Depending on the clutch condition you might net even need it, or not much. I believe any of the top brands will work, and I am assuming you have a LS rear end, otherwise you are just wasting your money on modifier.
Elder User
Joined: Nov 2006
Posts: 566
Likes: 1
From: Virginia
I put regular 75-140 in mine when I replaced an axle seal a few months ago because the store I was in didn't have synthetic. I'm not sure why it calls for synthetic, but nothing catastrophic has happened to mine yet. Should I rush out and change it to full synthetic?
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
I wouldn't worry about it, diffs have been using regular for 50 years and there are just a few good points about the synth, like higher extreme temperature ranges, works well with LS diffs with modifier, etc. When I was drag racing modifier always came in a separate little bottle for the reg oil. The front diff doesn't even "specify" synth.
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Elder User
Joined: Nov 2006
Posts: 566
Likes: 1
From: Virginia
I wouldn't worry about it, diffs have been using regular for 50 years and there are just a few good points about the synth, like higher extreme temperature ranges, works well with LS diffs with modifier, etc. When I was drag racing modifier always came in a separate little bottle for the reg oil. The front diff doesn't even "specify" synth.
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My Backpack Gots Jets
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From: LBC
Posting Guru
Joined: Oct 2009
Posts: 1,540
Likes: 1
From: Southwest VA
Yes ! that will work also......as Brent said......just make sure it has the modifer....or is ok for LS..........90 wt would work as long as it is full and has it's "whale oil" additive...........used for years on end.........there are just better choices out there these days
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My Backpack Gots Jets
Joined: Sep 2011
Posts: 365
Likes: 0
From: LBC
im going to get the Valvoline full synthetic 75wt-140. the material data sheet says it meets or exceeds the ford factory recommendations and not needing the modifier. now if my sore shoulder would just heal i can crawl back under there and fix it lol
Posting Guru
Joined: Oct 2009
Posts: 1,540
Likes: 1
From: Southwest VA
If you have LS and more than 100k it likely needs clutches rebuilt anyway......mine does and I don't even take mine on anything serious off road......anybody know if there are upgrades for the stock clutches ??
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My Backpack Gots Jets
Joined: Sep 2011
Posts: 365
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From: LBC
my EX has only 84k. plus i dont do a lot of offroading.