ritchie1791

In my 98 Trans Am I feel a bouncing from the rear like if I go up a hill or just typically driving down the road I feel the rear bouncing or shaking....its a weird feeling

lees02WS6

iTrader: (5)

Original shocks? Blown shocks will allow the springs to compress and rebound uncontrolled.

ritchie1791

But when I go on speed bumps they car doesn't bottom out or nothing

SparkyJJO

iTrader: (11)

Low speed vs higher speed makes quite a difference. Even worn out shocks can function well enough to dampen over a speed bump. If your shock fails to do even that, then they are extremely dead and should have been replaced a long time ago.

How many miles are on the car?

lees02WS6

iTrader: (5)

There's only so much going on back there. Two trailing arm, a panhard rod (6 bushings total), coil springs, and shocks. Shaking could be something else, but bouncy that's got shocks written all over it.

ritchie1791

you could be right.....because I do notice the rear bounce on low speeds and at higher speeds i still feel just a little but not as much

FirebirdTransAm

iTrader: (3)

Do you have stock suspension? A lot of time, people use the stock length bolts on after market parts and they are not long enough and the nuts fall off the bolts. I made that mistake when I installed my tq arm and the nuts eventually wiggled off leaving me with the bolts just chillin, every time I hit the brakes it felt like i was going to endo. From that point on.. hardware included please!

ritchie1791

I do have stock suspension. Like my u joints are brand new so I know thats not making my rear end bounce and my shocks....well I don't know but I can assume they are good since the car only has 50k miles

lees02WS6

iTrader: (5)

Get the rear up in the air, take the wheels off and nose around. Pull the sleeves down on the shocks, look for leaks, check the springs look for any signs of damage. Take some pics, and post them up.

98ws6blk

Mine seemed to do that before I put on relocation brackets...the brackets may just have covered up the real issue. Not sure if that helps...

ritchie1791

Everything seemed fine but I found a leak in my pinion seal.....it has been making a clunky noise when I change gears or step on the gas, its not my u joints I checked those out.

SparkyJJO

iTrader: (11)

Your U joints or pinion seal won't make the back of the car bouncy on bumps.

z28bryan

iTrader: (7)

Anyone who's read the threads on ls1tech suspension section for the past 10+ years or so until now would know the stock shocks have really poor damping. The shocks don't have to be blown to have poor damping control. Yes you will probably notice a lot of bouncing around in the rear with the stock shocks. New better shocks can fix this issue like Bilstiens or Konis. You can go with a cheaper set that some people around here prefer which will help a little but in the long run you will just have the same problem as they will soon wear out as well.

ritchie1791

You might be right because if I drive like a grandpa it feels fine for a while, however, if I take off like at a drag strip as soon as I go a steady speed it will feel all bouncy and shaky for a while then it settles out and smooths out but still kinda bouncy....

Carlos01SS

iTrader: (4)

your car has only 50k miles?
pretty good!
the only problem is that, with the factory deCarbon shocks, they really didn't amount to much when it came to performance.
You driving like a grandpa actually is a blessing because really, the factory deCarbon shocks only last about 20k-25k miles and that doesn't include the amount of years that they have been on your car, so your shocks have been blown for years buddy.

so at this point, anything would be better than what you have right now.

ritchie1791

alright then that decides it new shocks lol