Just installed Rancho RSX shocks 4 days ago. Man, what a great ride! They really stiffened up the truck, nowhere near the body roll it used to have. I feel like I have a high performance suspension on my 4x4 F-150!

 

You might also want to consider a Hellwig rear sway bar. It makes the truck very stable on turns. It made a world of difference when I did the RSX's and Hellwig sway bar.

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1999 F250 LD S/C XLT 4x4
5.4L, 3.73, 4R100 trans.
Flowmaster 40 "DF" series, K&N, Superchip, WMS Velocity Tube, Rancho RSX shocks, Hellwig rear swaybar, Stull billet grille, 2-PIAA Pro80XT's (120W), 2-KC Daylighters (150W), Clear Side Lens Mod w/ 9006 (55W bulbs). 265/70 R17 BFG AT KO's on 17x8 American Racing Atlas rims
Kenwood 7007 CD, Alpine 3342 Signal Processor, Alpine MRV-F353 5Ch. Amp, Pioneer TS-A6865 3-way speakers, MTX Thunderforms. CompuStar alarm/autostart. On the way: Performance Accessories 3" body lift, 33/12.5/17 ProComps, GSP grille guard and more KC's

 

One thing that concerns me about my RSX shocks is, I noticed when installing the front ones that they don't allow full upward travel of the suspension. With the truck on stands (under the frame) allowing the front suspension to fully extend, the shocks at their full extension lacked about 1/2 an inch from touching the top shock mount. I'm afraid if the front suspension ever fully extends hard, it will result in damage to the shock(s). In other words, they would top out. I actually had to put a jack under the lower A-arm to get the lower rubber bushing to contact the shock mount so I could tighten the nut properly. The stock units weren't like that. They had enough travel to allow full extension of the suspension without topping out. I've been meaning to post this and ask if anyone else noticed this condition when they installed theirs? Also, if anyone has had any problems as a result?

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98 F-150 XLT 4X4 ORP Super Cab Short Bed, 4.6, Auto, 4.10's, Mag-Hytec diff. cover, Magnacharger supercharger, K&N FIPK, Superchip, Gibson single cat-back, 80/100w German head lamps, 80w amber fog lamps, Warn HS9500i winch with semi hidden mount, Wrangler dual battery kit with red & yellow top Optima batteries, 285/75R16 Goodyear MT/R's, 16x8 Center Line Hell Cats (JUNK WHEELS), Rancho RSX shocks, B&M deep aluminum trans pan, Rhino bedliner. Needs one more door.
http://hometown.aol.com/ninetyeightfword

 

The difference in the travel of the RSX concerned me too. I talked to a Ford technician, and he told me the factory shocks are generic shocks. It doesn't matter if you truck is a 2wd, 4wd, F-150 or F-250, they all get the same shock. He said, the shocks that come on the truck are too big from the factory, because they have to be big enough to clear an F-250 4x4. That seemed to make perfect sense to me, and he said there is nothing to worry about.