rear diff fluid
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Joined: Aug 2004
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From: Connecticut
Hopefully not. It's suppose to prevent diff clutch chatter. I'm reading the book about the theory of operation, and the clutch works/compensates when one tire is slipping. I hope you didn't tow off road or in slippery condition 
You're good, just get a bottle as soon as you can and put it in there. This is a dealer only item, I believe. That's where I got mine.
By the way, while you're under your truck, it may be worthwhile to check the vent tube on top of the diffrential shaft if you have one, I found mine on the driver side.
Somebody posted here that it got clogged, possibly causing rear wheel seal leak.
You're good, just get a bottle as soon as you can and put it in there. This is a dealer only item, I believe. That's where I got mine.
By the way, while you're under your truck, it may be worthwhile to check the vent tube on top of the diffrential shaft if you have one, I found mine on the driver side.
Somebody posted here that it got clogged, possibly causing rear wheel seal leak.
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Elder User
Joined: Dec 2003
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From: shelocta, pa
thanks i'll check it out. I had it on the road the whole time. so i hope to get it done tomorrow night. We have 2 more fights this truck week and this has to pull the ring. it's about 5500lbs.
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From: shelocta, pa
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Tuned
Joined: Jan 2005
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Originally Posted by wrenchturner
I Got It In. That Stuff Stinks. Thanks Yall
-You only needed to do what you did if you have limited slip
-If you DO NOT have limited slip, your gear oil is too heavy of a weight.
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Elder User
Joined: Dec 2003
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From: shelocta, pa
yeah i have a LS. It's on an FX4. H6 axle code 3.73 LS. I like this ratio alot since I've been pulling a trailer. Has anyone had issue with the rear axle? This is my first IRS.
Last edited by wrenchturner; Jul 25, 2007 at 05:20 PM.
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Joined: Aug 2000
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Ford specifies 75w140 synth in both open and limited slip diffs, front and rear axles through out the light truck line through super duty. It is also the in service replacement for FHLP gear oil found in earlier models.
Fleet Mechanic
Joined: Jul 2003
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From: Houston
Originally Posted by cleetis
Ford specifies 75w140 synth in both open and limited slip diffs, front and rear axles through out the light truck line through super duty. It is also the in service replacement for FHLP gear oil found in earlier models.
Just a few variations, but still noteworthy.
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I had my seals done at the beginning of summer and I am not sure if they put friction modifier in when they changed the fluid. Is there any way to tell? symptoms? It is an 03 XLT with 3:73 LS. I am a little concerned now.
R
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If only ford could build F150 and expedition axles as well as the super dutys. I go through so much 75w140 on those with there leaking seals. dont rember the last super duty that had any axle work done other then the std. brake job. forget that they do vary there oil weights. when in doubt check your axle tags.
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Joined: Mar 2003
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From: VA
Originally Posted by racerock
Question - did you first check your axle code to check your gear oil requirements?
-You only needed to do what you did if you have limited slip
-If you DO NOT have limited slip, your gear oil is too heavy of a weight.
-You only needed to do what you did if you have limited slip
-If you DO NOT have limited slip, your gear oil is too heavy of a weight.
Elder User
Joined: Mar 2003
Posts: 689
Likes: 1
From: VA
Originally Posted by Rentaltux
I had my seals done at the beginning of summer and I am not sure if they put friction modifier in when they changed the fluid. Is there any way to tell? symptoms? It is an 03 XLT with 3:73 LS. I am a little concerned now.
R
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