Hey guys,

I've had my S2k for over 50k miles, now has 123k on it, long time owner (over 10 years) and this is a new noise for me.

I'm getting a clicking noise that is intermittent, only sometimes happens thats coming from the rear of the car. It ONLY happens in gear, and it seems to be speed related. The faster I go, the faster the clicking occurs. 2k rpms in 3rd gear, the clicking is faster than 2k rpms in 1st gear.

Related symptoms: Accelerating in first gear seems to make the shifter "wobble" or shake. Interestingly enough, if I drive the car on the freeway for an extended period of time, the clicking seems to go away, and is hard to reproduce, however once I go slow, and it comes back, it stays and is VERY easy to reproduce, until I drive on the freeway for 15-20 minutes again.

My wheel bearings have been tightened for several years now. There's no "whirring" noise like I've had with wheel bearings, and this noise started out of the blue, instantly a few days ago. Also, the noise will stop as soon as I put the clutch in, so I dont think it's a wheel bearing.

If anyone has an idea of what the culprit may be, I'd love to hear some ideas. The rear diff is due for a fluid change (closing in on 30k miles since last change) so I'm a little afraid I may have broken a tooth or something. However, I also think that noise would be constant despite being in gear or not, so maybe the prop shaft??

Thanks!