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2005 GT 4.6 rattling/knocking noise when turning/accelerating

3046 Views 10 Replies 6 Participants Last post by  S197_2020
Hi community,

I finally decided to open up a new thread to make use of everybody's knowledge, advise and experiences. I already read trough Dingo7222's thread which sounded exactly like the problem I have with my car. But, I checked the motor mounts and especially the spacing of the steering shaft and came to the conclusion that my problem is different from his.

Repairs that have been recently done:

- Lower ball joints
- inner tie rod ends
- outter tie rod ends
- sway bar links
- both front strut assemblies

After replacing all these parts, the noise is still there but it improved slightly. Especially when I'm turning right and accelerating there is a rattling/knocking and grinding noise. Also when accelerating from a full stop or driving on a bumpy road the noise will come up. You can definitely feel the vibrations. Surprisingly, during left turns the sound disappears. I jumped into the passenger seat today and could feel the knocking/grinding/vibrations under my left foot, pretty close to the middle console in about the left center portion.

The intensity increases when taking longer drives and the car heats up. What I also felt was a drop in power when I shift from the 4th to 5th gear, I don't know if this is also related to the issue. When I pull it out of my garage and go to work, (3 miles one way) everything is fine and I can barely feel it.

Does anybody have a clue what it could be? Maybe something with the drivetrain? (shaft)

I really want to get this fixed as its really annoying and driving me crazy.

Thanks in advance!:grin:

*EDIT: Just took it for another drive. After the car and parts warmed up, when accelerating slowly out of a full stop there is a grinding noise in the section mentioned above, accompanied by little resistance until picking up some speed. It might be a driveshaft bearing, that is something that I am guessing right now.
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I honestly don't see where a new drive shaft will solve anything. Save your money.
You might be on to something with your concerns about the bearings.
What's the history on the transmission. How old is the fluid.
As mentioned earlier, if the motor mounts and front end bushings are original, I'd replace those dried out, crumbling parts. Cost way less than a drive shaft.
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