Correct Differential Oil?
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Freshman User
Joined: Aug 2003
Posts: 30
Likes: 0
From: WI
Correct Differential Oil?
I'm about to change my differential fluid in my 1994 4.0L ranger and want to make sure I have the right stuff. The owners manual specifies M2C154-A and I have no idea what that's equivalent to. I have some 80W-90 Valvoline Gear Oil. Is this the right stuff? I also got the additive for the L/S axle to add. Thanks in advance.
Post Fiend
Joined: Feb 2003
Posts: 6,940
Likes: 2
From: Eastern WA
I changed the rear end oil in my 94 4.0 4x4 supercab yada yada etc 2X so far. First time I used Permatex black and all was well. Ford didn't even offer a gasket. All was fine. Then I changed rear end oil for a second time and I found out Napa had a gasket. BAD MOVE. I installed it and shortly after doing so the rear end cover cracked as evidenced by a leak. I'd strongly suggest using the OEM method; use Permatex black and save yourself a headache 
Laughing Gas
Joined: May 2003
Posts: 1,136
Likes: 1
From: Scenic Wisconsin
75W-90 syn is fine as a replacement for 80W-90. Check your owners manual first, because some of the newer trucks use 75W-140.
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Freshman User
Joined: Aug 2003
Posts: 30
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From: WI
Thanks everyone. I got it all changed. I ended up using RTV (permatex orange colored). Having this forum really helps. Thanks again.
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