Beastmode89

iTrader: (2)

I have been having issues with a rough ride in my DD 2002 T/A. I bought the car recently as a DD and it wasn't in the best condition. It had 94k miles, lowered on stock shocks and eibach pro kit. The rearend broke shortly after buying it. I took the opportunity to fix multiple things at once.

-rear rebuilt with ratech deluxe gear install kit. did not replace gears.
-replaced one of the axles (not sure what brand, mechanic ordered it)
-replaced shocks and springs with SLP eibach/bilstein kit
-replaced rotors and pads (cheap stuff from ws6store)
-installed adj panhard bar and LCA relo brackets that are set to the lowest hole (founders)

I just got the car back and decided to drive it to a conference this past week. At interstate speeds (75-85) I am getting a very constant bounce. Like the kind that rattles your teeth. Where do I need to start if I want to eliminate this problem?

Wheels are c5z replicas 17x9.5/18x10.5. Nexen 3000 275/40r17 up front and Nitto Invo 295/35r18 out back. Tires have about 7k miles on them. I think I'm running either 32 or 36psi all around.

Thanks

N20zuki

Have you had the tires balanced yet? Thats the first place I would start.

Beastmode89

iTrader: (2)

Tires were balanced when they were installed by discount tire 7k miles ago. I also had the car aligned a few weeks ago when I got the shocks/springs installed. Would they need to be rebalanced after changing the ride height of the car?

02TransAm/Batmobile

iTrader: (32)

Is the SLP/Bilstein combo a brand new setup or did you buy it used? The bouncing could be attributed to poor rebounding from the shocks.

VinR1

iTrader: (17)

Sounds like a bent axle... Put the rear on jackstands, start the car, put it in gear, and look for any slight wobbling on either wheel

Beastmode89

iTrader: (2)

Shocks and springs were brand new from ws6store. Wouldn't the car be rough at all speeds if the axle was bent? It's smoother at 120 than it is at 75-85. It's also really smooth at low speeds. Just rough at interstate speeds. Highway speeds are fine

VinR1

iTrader: (17)

My bent axle vibrated progressively harder up to ~60mph then suddenly went away...

trans_am7935

iTrader: (15)

sounds like a wheel is out of balance. that is the sweet spot for slight out of balance. it a inner wheel weight was scratch and material was removed, that could to it. that happened to me when i took the wheel off to fast, it fell on the rotor and removed some of the weights material, had a vibration from 55-65 till i rebalanced them. it is a cheap fix, i would just get them rebalanced.

Beastmode89

iTrader: (2)

I'll drop by discount tire after work one day this week and see if a balance does anything. I swear this car has been nothing but a money pit since I bought it. I might just sell it and get a frc for my dd, or steal my old dd t/a back from my wife and get her a car

02TransAm/Batmobile

iTrader: (32)

I hear ya. Either we spend money fixing it or we spend money modding it - it never ends!