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Ford Truck Club Forum > ALL OTHER FORD MODELS > Ford Expedition



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Old July 4th, 2016, 03:32 PM
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Default 1999 Expe Rear End ID Tag Help

HI,
I am getting ready to change rear axle bearings and at least the passenger side axle. I am trying to determine which rear this is so that I can gather the parts before the truck gets torn apart.
Can anyone help me out here?
I understand that there are several different axles (spline count etc).

Here's what I THINK the numbers are:

3 S 939 A
L55 9 75 9F 18

Thanks
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  #2  
Old July 4th, 2016, 10:42 PM
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That's a 9.75" rear, 3.55 limited slip.

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
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Old July 8th, 2016, 07:12 AM
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Thank you!
I have been driving this truck for 100K miles. Never paid much attention to details like that. I work on my other cars, my boat, my little tractor etc but the Expy never needs much. Now its time to show it some love so I have a lot to learn.
To continue, now that I know the 9.75 by counting the bolts I see that its a 12 bolt main (?) correct? Next, from what I read, it needs 34 spline axles (?).
Feel free to let me know where I am wrong and thanks for taking the time to get me started in the right direction.
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Old July 8th, 2016, 07:45 PM
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don't assume on the spline count without putting your eyes on the axle

but more than likely if the tag is still intact , it has not been opened


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