There's a stretch of Interstate 10 near my work (Rosemead/San Gabriel/Alhambra, CA) which is a test strip for car suspensions--even the smoothest cars show some bounce bounce bounce.

Recently, I noticed that my 240D bounces here a lot more than normal; the whole car bounces, and I with it, so much so that it's hard at points to keep even pressure on the accelerator pedal. I could take a different route to work, but the problem is, my other cars, including a 300D, don't bounce nearly as bad as this one on this stretch of road.

I tried changing to a new pair of front shocks (KYB), but no difference at all (my old Bilsteins were a little worn).

I think these are the possible explanations:

1. Problem is with KYB brand; should have gotten Bilsteins.
2. The rear shocks are actually causing the bounce; replace them as well.
3. Recently, I had discovered a broken rubber exhaust hanger at the back and fixed it with some 12 gauge electrical wire. Could this have stiffened something which should have remained flexible, thereby causing bounce?
4. Some other suspension component is responsible for the terrible bounce?

So, what do you think? Has anyone else dealt with something like this before?

__________________
J. S. Park

'82 240D Manual 240D (sold)
'83 300D-T 230k (sold)
'84 300D-T 118k (sold)