Rear Diff fluid
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Senior User
Joined: May 2006
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From: Elmendorf AFB, Anchorage
Rear Diff fluid
Since I have about 50,000 miles on my truck i'm going to change the rear diff fluid. Does anyone recommed any particular fluid? I always used some off the wall 90w. What about a limited slip additive? Anything good?
Fleet Owner
Joined: Jun 2004
Posts: 25,090
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From: Rio Rico, AZ.
For my open diff I use Redline Shock Proof Heavy gear oil. I used it to quiet down a clunky rear end in my '91 F-250. It would give a heavy knock sound at the start of every accelloration from a stop light. After changing the rear end oil for the Shockproof it never knocked again.
http://www.redlineoil.com/products_g...6&categoryID=6
There is a lot of other choices from them as well.
http://www.redlineoil.com/products_g...6&categoryID=6
There is a lot of other choices from them as well.
Logistics Pro
Joined: Aug 2005
Posts: 3,884
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From: Morgan Hill, CA
If you have a limited slip diff, you want to use 75w140 SYNTHETIC. If you buy Red Line, don't buy the "LS" stuff. Some trucks require the friction modifier with some oils, some don't. Friction Modifier is $5 for a small bottle at Ford.
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From: west MI
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Joined: Jun 2004
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From: west MI
Originally Posted by 2002f2507.3LPS
how do u know if u have the limited slip diff?
Could someomne chime in on why some have the code on door sticker and others do not
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Joined: Sep 2006
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From: CT
well one tag said this on it. ( S 409 H ) below that on the same tag it said this ( L 73 10 5 1K 17 )
the other tag just said ( 75 w 140 synth oil only. ) wich im sure is just the oil to refill the rear end with.
the other tag just said ( 75 w 140 synth oil only. ) wich im sure is just the oil to refill the rear end with.
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Joined: Jun 2004
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From: west MI
Originally Posted by 2002f2507.3LPS
well one tag said this on it. ( S 409 H ) below that on the same tag it said this ( L 73 10 5 1K 17 )
the other tag just said ( 75 w 140 synth oil only. ) wich im sure is just the oil to refill the rear end with.
the other tag just said ( 75 w 140 synth oil only. ) wich im sure is just the oil to refill the rear end with.
Post Fiend
Joined: Jun 2006
Posts: 5,497
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From: Central, Al
Originally Posted by herman2001
I changed mine last month when the rear diff cover rotted off... I just put in delo 75w90 and no problems so far
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From: Elmendorf AFB, Anchorage
Originally Posted by amiller93
Unless you have a different rear end the 75W90 is for the front and the 75W140 is for the rear
Now with that fluid, what outside temp is it good for? Just wondering if it will hold up to the temp in Anchorage. Last year it got to -25 degrees outside.