Originally Posted by E_cox310
I've been dealing with this for a while but I just never thought to ask. When I come across several bumps in the road, my acceleration somewhat gets thrown out of whack and the rear end seems to bounce over the place. Is this due to fact that our cars don't have IRS? Is there a way to decrease this feeling? My suspension mods are as follows... FFRP K Springs, FRPP shocks/struts, 295/35/20 rear tire. Thanks
Getting a stick axle car to accelerate smoothly on a washboard road (what you seem to be describing) is problematic at best.
First line of defense might be to check what the rear tires are inflated to. If you've still got 32 or more psi in them, it's too much. Try running 28. Those 295/35-20's will still have adequate load capacity at that pressure, especially if you don't commonly carry lots of heavy stuff in the trunk or adult passengers in the rear seat very often. How wide are your rear wheels? That might affect my recommendation slightly.
Next is rear shocks. Ford's OE shock/strut valving philosophy is a bit on the harsh side, which I think may have carried over to the FRPP line. Honestly, with the stiffer springs I'd take a long and very serious look at the Koni Sports (aka "yellows, and adjustable). Although the STR.t's are a little lighter on the wallet, the adjustability of the yellows gives you a better chance to solve your problem (hint: start full soft and dial them up in 1/8 turn increments, hint #2, it's OK if the front struts are set a little firmer than the rear shocks - or even a little softer for some conditions and driving styles).
You've got the 4.6, so if you really aren't getting all that hard into the throttle I doubt that you're getting wheel hop directly from the power. Only from the road contour. That's not to say that aftermarket LCAs and possibly relo brackets won't help, just that I'd try the other things first.
A Watts link could conceivably help a little in a few specific situations, but I wouldn't rank it very high here even though it's a pretty good mod for the more serious corner-carver.