1FastS2k

Just reread your post and it does sound like axle pitting. I was doing some reasearch about the DSS axles for the S2k and found some not so good reviews. A fairly quick thing for you to try is the T1R axle spacers.

My issue is different. My noise sounded like a rear wheel bearing so I have replaced both rear wheel bearings, hubs, and found some used low mileage axles and paired them with my old T1R spacers and the noise/vibration continues. I'm pretty sure it's drivetrain related because if I put the car in neutral the noise/vibration goes away.

I remember quite a while back I thought I noticed some fluid leaking out of the rear diff mounts, but just attributed it to left over remains of the coyote I had hit. I'm wondering if bad diff mounts could have enough play to cause noise/vibration.

Another thing I noticed is that mine used to only happen at 90+ speeds but I replaced the motor/trans/clutch/motor mounts and now it is happening at 45+ speeds. My motor mounts were done!

starchland

vibration here as well mostly all the time and while cruising at highway. the inner buckets were completely fine on mine!

1FastS2k

I figured mine out. It was the diff. I think a few years ago (100k+ mi) when I originally had my 4.77s installed they were not shimmed properly. The inner parts of the teeth on the ring and the outer parts of the teeth on the pinion were worn away. I had new gears put in and a full rebuild and my car is super smooth and very quiet now.

That's just my personal experience, your results may vary.

cmn

Sorry I haven't posted anything more here, but my car hasn't been used for over 2 months as I have changed the engine, waited for some parts and is getting it tuned now.
1FastS2K, did you have light vibration as well? And was it all the time, or just when accelerating?

kimnkk

have you checked your diff bushes? They can cause vibration under load, but only if theyre pretty stuffed, maybe 2 of them stuffed etc.

cmn

Haven't checked those. Thanks for the tip! Will check them asap.

1FastS2k

Yes, harmonics and vibration at 40+ mph.

SpitfireS

Its hard to miss a leaking rear diff mount.

Its not as simple as a worn rear shockabsorber.. is it?
Find a tireshop with a shock tester.
Worth a try.

cmn

I have changed the shockabsorbers for new coilovers. I'll get under the car and check some more once I get it back.