For those with an 04, you can get a set of polyurethane bushings for the rearend (at the point where the IRS attaches to the body). These bushings GREATLY reduce some of the wheelhop culprit common in the 04 models.
Some of the items offered by Energy Suspension are below:
Year - 2004
Front End Control Arm Bushing Set - 3.3187
Rear End Control Arm Bushing Set - 3.3188
Front Sway Bar Endlink Set - 9.8161
Front Sway Bar Bushing Set - 28mm - 3.5210
Complete Rear Sway Bar Bushing Set - 20mm - 3.5211
Rear Sub-Frame Bushing Set (street firm) - 3.4125 (126)
Rear Sub-Frame Bushing Set (race firm) - 3.4164 (127)
OR, you can get the complete package.
HYPER-FLEX SYSTEM Complete Master Bushing Set Includes: Front control arm bushings, rear control arm bushings, front sway bar bushings, complete rear sway bar bushing set, rear sub-frame bushing set (street firm).
Part No.: 3.18134 (126)
How much for these parts? Well, the rear subframe bushing set, which controls a portion of the wheelhop, is $96!!!