Thread: Knocking sound
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Old 05-20-07, 12:01 PM
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Re: Knocking sound

Quote:
Originally Posted by Superjim View Post
Yep, same exact tires. Air pressure is the same. 35 front 32 rear. Really same everything. Both are Performance Sedans. Even same color. White Lightning.

I even went to the dealer and had them print me off the build sheets for both cars so I could compare them side by side. There is THAT much difference in the two cars. I figured something was different about the suspension options. Obviously there is a big difference, or I would not have gone to all that trouble.

They check out (on paper) to be exactly the same. The only differences are the first one had the retractable sunshade for the rear window and no NAV and this one has NAV and no sunshade.

The new one sits higher from the ground then the first one. The first one had more of a hunkered down look. The fender wells were closer to the wheels. That was probably why it rode rough but handled like it was on rails.

The Service Manager worked with the new one for about two hours one day with a Tech 2 and finally got it to lower about an inch all the way around. That helped quite a bit. Made it handle a little better but increased the ride harshness a little also. I will put up with a little stiff ride as long as it handles better.

The first one was more like a BIG 4 door Corvette. Handling on it was awesome but it did ride rough. More than once, someone has remarked, "This car don't ride like a Cadillac." This one rides more like a Cadillac should but doesn't handle like the first one.

I can't explain the HUGE difference in the two identical cars, and (so far) neither can anyone else. I thought when I bought the first one... "Man, this is great. Cadillac got it RIGHT. People will LOVE these cars." Now I am thinking that the first one was an aberation and that THIS one is normal. This one is OK, but the first one was, as Tony The Tiger would say, GREAT.

All thoughts and ideas are welcome.

Jim from Texas
An equipment change doesn't appear on the build sheet. If your first one had a stiffer anti roll bar, stiffer springs, lower springs, etc. and GM changed it mid year to a higher softer set-up with different suspension parts you wouldn't see that. You would have to check part numbers for each car and even then they might be same if they updated their parts computers with the new part numbers already. D3 might have a set of lowering springs to get your handling and lowered look back.
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