The R

<u>Details on the car:</u>
This past Nov/Dec, I replaced the snub mount (APR, motor/tranny mounts (034 street density) and have a new OEM rear diff mount. Also, the driveshaft is a total rebuild. Front axles were replaced spring 07 as well.

<u>Here's the problem:</u>
I get this vibration above 60mph that will come and go. I can hold speed at say 65mph. The rear end (at one time I thought it was the front) will vibrate like a bent rim, bad balanced tire, then it will go away and ride smooth like nothing is wrong. It alternates back and forth between the two conditions. Started right after the motor/tranny mount install or shortly after. Also, something does seem a little out of balance when I'm at very low speeds (10-20mph). I thought it could be a tire but it goes away and comes back. I've had 40 series or lower tires for the last 11 years so I know what I bad balanced or bent rim feels like. This is different.

Any ideas?

I'm wondering if something is not installed correctly or out of alignment. Motor does seems to maybe move more than I thought it should after replacing everything. Could be I'm hyper sensitive to everything right now since I'm in troubleshoot mode too. I didn't notice the car doing this before the motor/tranny/diff mount, driveshaft install.

I appreciate any ideas before I start climbing under/around the car. It's been cold here so i haven't felt like messing with it til now since it's warming up.

ErikS4

Are all the wheels tight?

The R

Yes.