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Unread 10-28-2013, 07:15 AM   #1
RUGLAYR
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Join Date: Sep 2013
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Diff fluid

So I'm getting ready to change my diff fluid 2005 wk limited 4.7 and was wondering if when using Mobil 1 75w-140 LS do I need to add limited slip additive and can I also use the same fluid front and rear. I have read many posts but can't seem to find a for sure answer. Thanks

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Unread 10-28-2013, 07:22 AM   #2
caulk04
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I don't trust any fluid to negate the need for LSD additive, so I always use it. I always use the factory additive also, seems to work better to me and it doesn't really cost much.

The 75w-140 is good front and rear.

NOW - Do you have QDII or QTII? If 'Drive', you need the additive. If 'Trac', you don't.

Not sure? Count the rear diff bolts. 12=drive 10=trac
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Unread 10-28-2013, 07:45 AM   #3
RUGLAYR
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I have the 10 bolt rear
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Unread 10-28-2013, 08:16 AM   #4
caulk04
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So you've got quadra-trac. Standard open differentials that don't need LSD additive.
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Unread 10-28-2013, 08:20 AM   #5
RUGLAYR
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Great. Thanks very much for your knowledge
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Unread 10-28-2013, 10:19 AM   #6
lekmedm
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Quote:
Originally Posted by caulk04 View Post
So you've got quadra-trac. Standard open differentials that don't need LSD additive.
^^^This is the definitive answer!
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