Thread: Why new motor mounts?

Guys, I see lots of people on the W-bodys change the lower engine and trans mounts. My Monte Carlo has 85K on it. The trans shop that is trying to help find a bounce out of the car says the mounts "look" great. Other than just the fluid showing a mess and maybe the mount squished out why are you guys changing them?

My car has new axles with less than 300 miles, new wheel bearings less than 5K miles and new tires less than 3K miles that were road force balanced. The issue comes and goes but is a lot worse lately. I saw one post on here the lower mounts were neednig to be changed on his at 61K miles.

I know mounts are cheap but have you guys seen a difference in the ride of the car when the mounts have been changed? Does changign to the rubber instead of the fluid filled show any improvement?

Thanks for any help.

Mine only clunks some times and generally looks very clean under the car. Maybe that isn't it.

Dang bill my mount almost looks like that lol smh.

Originally Posted by bluegtp91

If your mount is squished...

Or if there is a obvious sign of fluid that has puked from it...

Then yes, they need replaced...or another tall tale sign is looking at your motor from the top of the engine bay...does it look like its leaning to one side? One side...say, the left side lower than the right?

Mounts are a great way to improve driveability and better traction/power transfer/feedback to the driver...I'd opt for the solid rubber replacements, and ditch thinking about putting some factory fluid filled ones back in...because...they will do just what the ones you have in there now are doing...FAIL.

To add, click the link in my signature...there is a free mod called the "Dog Bone Flip"...look into it...that'll help as well when you put the new lower mounts in to take some strain off of them and increase the life of them by quite a bit.

The trans shop that has been looking over a slow body oscillation/vibration claimed the mounts looked great. I was just asking if the fuild had leaked and the car got cleaned before I bought it what would I feel if they had leaked. The bottom of this car looks almost new it is that clean with 85K miles now..

They are putting in solid rubber moutns in the morning. I will flip the upper dog bone mounts tomorrow when I get the car home. This is a stock 04 Monte Carlo SS SC car that has been to the track a couple times.

OK, motor mounts changed to solid rubber mounts. I flipped the radiator support mounts also. I can tell a difference in the vehicle dynamics but the original problem I am chasing is still there.

Now what next? Is it the 25 lbs of road force bouncing the car around?

This is a very helpful thread for me! I also have the bounce/clunk. I can see my engine leaning more to one side. Is the motor mount hard to change? I'll be checking my struts tomorrow too!

Originally Posted by TLSheff

Next I would look into this, just as an option of where to start. Clunks can be all sorts of things, I have to inspect my car for one it started about a month ago... tech said it could me a mount (motor/tranny or front strut) or it could be the intermediate shaft. but start with the easy one.

Red circle... does yours look worn like this???

http://www.grandprixforums.net/what-...pic-62788.html

I will have to look today but I have not noticed anything like this. I do have the intermediate shaft clunk sometimes but I know what that feels like and how to reduce it for a while..

Originally Posted by mrfreez

This is a very helpful thread for me! I also have the bounce/clunk. I can see my engine leaning more to one side. Is the motor mount hard to change? I'll be checking my struts tomorrow too!

Sorry, I don't know how hard it was. I paid a shop to install the lower mounts. I didn't have the time to mess with this.