I have an 04 and even with only 200 miles I have felt partial throttle wheel hop. (the ground is so cold I cannot get any traction as it has been between 10 and 20 degrees for almost 2 weeks now) I have been considering the RPM rear diff support. Does anyone have any experience dealing with the hop? I will race the car and will probably use either BFG or the new Mickey Thompson drag radials. I tried Nitto's on my Lightning and thought they were junk on the street and track. I ended up running Hoosier 12" slicks, but with the Cobra it would be a real pain taking slicks and a jack, etc. to the track so I will try drag radials again.
No need to buy a rear diff support because the '03/'04's came with one from the factory! You would gain nothing but a lighter wallet by installing the RPM model. The aftermarket supports will not make any difference in the hop. Keep in mind the hop is ALWAYS going to be a lot worse in cold weather. There are a few things you can do to reduce it though. Adjustable shocks with stiffer rebound dampening. I suggest the anti-hop shocks from HBH (Horsepower by Herman). Some people have had good luck with the QA1's too. Poly bushings for the IRS from Maximum Motorsports will help a little too. Those are a real PITA to install though. Bigger, stickier tires will also help some. About the only SURE way to get rid of the hop is to swap the IRS for a straight axle.... U.M.
