are you wanting to replace it because it is bad and giving you problems, or just because it is "old".
my 02 has the stock stabalizer on it with 185,000 miles on the truck. the stabalizer is still in good shape.

 

I don't really know if it's in bad shape or not. The truck it came off of had a 125k on it and I've put another 40k on it myself running 19.5 tires. They weigh 150+ lbs each and I figure will wear out everything on the truck faster. I also figure that the Bilstein will be better even if it's still good. This is a cheaper alternative to a dual shock system which I hope won't be necessary

 

do a simply test, remove the stabalizer and push it in and out. It should have plenty of resistance in both directions, if it flies in and out with little to no resistance then its junk. And i replaced my stock one at 70k cuz it leaked all the oil out i then put a stock replacement from Monroe on it and it was perfect then i had the bright idea to add dual stabilizer kit and other than it looks somewhat cool it makes the power steering strain more in the winter i suppose because the oil is like molasses

 

Hello Everyone... I have a related question so I thought this would be a good place to ask. I just purchased an 04 F350 CREW 4WD FX4. I noticed the steering wheel was a little sloppy going over big potholes. So I inspected the steering stabilizer. It was definitely old and leaking. BTW,
I plan to upgrade my shocks and steering stabilizer to Bilstein 5100s, but I figured I'd throw on a less expensive working stabilizer in the meantime. I purchased the Monroe Magnum Part# SC2961 which my friends at Rockauto listed as a favorite.
Here is the problem, after installing it I realized it is a few inches shorter than the one I took off. Turning right is great, turning left… Not so much.
I've been trying to look up the specs for the Motorcraft Part#3E651 (ASH-24439), overall length, length of the piston and travel.
Does anyone know this information or the specs/part number of the one I need???

UPDATE:
It turns out various parts suppliers offer the Monroe and KYB shocks as replacements however if you check. The overall length and travel vary. The Rancho 5000 has 3 inches more travel than the Monroe and KYB. I'm sure I could move the bracket to compensate for the shorter piston, but I think that will limit my turning radius. As of now I plan to install the rancho and make sure the mount is located in the center of travel.

 

p_arbor: Reps sent to you for your UPDATE above. Thanks for the heads up.

Today I ended up ordering a genuine Ford OEM stabilizer replacement to avoid the different length issues of the aftermarket replacements identified by P_arbor. The only other option I considered was the Bilstein 24-158848, as I've seen it in action on a friend's Ex. In the end however, it ended up being less expensive for me to go with the Ford factory replacement, especially since I run stock tires at stock ride height.