Rear Diff Fluid

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Jul 10, 2019 | 05:32 PM

Watsy

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Cross-Country

Joined: Jan 2019

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Rear Diff Fluid

Hi all, Is this an acceptable oil for my truck and would I need extra friction modifier?
Has the 3L Code 10.5" LS diff from what I understand.
Thanks

Jul 10, 2019 | 06:27 PM

Just Strokin

Post Fiend

Joined: Nov 2001

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From: Tallassee, ALabama

That should be ok since it has the LS friction modifier mixed in with the gear lube. If you get some chatter as you turn corners, you can always add some more fricition modifier.

Jul 10, 2019 | 09:12 PM

A/Ox4

9 ECHO 1

Joined: Aug 2009

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From: Missouri

That's what I use.

Jul 11, 2019 | 01:40 AM

SuperDutyScaler

Lead Driver

Joined: Nov 2008

Posts: 8,450

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From: South Jersey

Mobil1 is the go too, I personally use dino 75w140 and change ever two years. I do have a Detroit locker though

Jul 11, 2019 | 06:02 AM

john hardy

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Can’t see why you’d need anything but that. Friction modifier included.

Jul 11, 2019 | 01:08 PM

CousinCarl

Fleet Mechanic

Joined: Oct 2008

Posts: 1,321

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From: North Texas

I didn't need to add modifier to it in my 3.73 LS rear end. No chatter. But like @Just Strokin said, if it chatters, then add some.

Jul 12, 2019 | 02:01 PM

Watsy

Thread Starter

Cross-Country

Joined: Jan 2019

Posts: 79

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Thanks all.

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Jul 12, 2019 | 02:49 PM

David Karpinski II

New User

Joined: Jul 2019

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From: Point Plesant, NJ

Dear Watsy,
Should work out just fine. I'm not a synthetic guy tho. I have had clutch chatter before and even added extra friction modifier. Still had the problem after 500 miles of " break-in period ". But I have read everyone's comments and to each their own. But like they said if you do get chatter add extra friction modifier and you should be just fine. I recommend Ford friction modifier for all clutch type lockers doesn't matter what its going in. That stuffs the best. Good Luck.