'03 XLT/FX4 Level 1 diff questions - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 08-28-2010
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'03 XLT/FX4 Level 1 diff questions

I haven't been able to find a clear answer on this but since my truck is an '03 4x4 with the FX4 Level 1 package on it, does it take 80w-90 fluid or 75w-140 fluid? Seeing as how the level one is basicly the same as a regular XLT 4x4 I'm not sure. Would like to change it out soon, want to make sure I get the correct fluid.

Also, I would assume this truck has the 4:10 limited slip...is it also limited slip in the front or just open?

Not real clear about what exactly the fx4 L1, L2, and regular XLT 4x4 differences were in '03.
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Old 08-28-2010
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look in your owners manual...it will tell you what to use
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Old 08-28-2010
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80w-90 with a friction modifier, and the front dif is open. The level 2 had 31 spline axles and torsen limited slip.
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Old 08-28-2010
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Originally Posted by MothMan999 View Post
80w-90 with a friction modifier, and the front dif is open. The level 2 had 31 spline axles and torsen limited slip.
Thats kinda what I figured. Same as regular 4x4
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Old 08-28-2010
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Originally Posted by djfllmn View Post
look in your owners manual...it will tell you what to use
I did but not sure which fluid I should used based on the differences due to level 1 vs level 2
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Old 08-29-2010
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do you tow? play offroad much? go with the 80w-90 ( if you ever play in the water run synthetic or just change it out after you get wet...) I run a 80w90 synthetic blend in my Jeep with the ARB's and change out anytime I go swimming just incase...

My trucks running whatever ford put in it ( only been changed somewhere around mile 6000) 130,000 something miles ago.... Same as the tranny...
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Old 08-29-2010
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do you tow? play offroad much?
Tow a few times a year, play offroad or go swimming? Nah...just an occassional romp around a field.
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Old 08-29-2010
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what spline count is the diff in the fx4 off-road
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Old 08-29-2010
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i think their 28 spline axles
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Old 08-29-2010
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Can you tell me what gear ratio mine would have? I would assume 4.10
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Old 08-29-2010
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yea because you have an fx4 id say your axle code is R7 which means you have an 8.8 4.10 LS rear axle
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Old 08-29-2010
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Quote:
Originally Posted by klc317 View Post
Thats kinda what I figured. Same as regular 4x4
no not the same the regular 4x4 has axle code 97 which is an 8.8 4.10 open rear axle...i feel like shane now lol
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