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Sorry if this has been covered before, I can't recall reading anything. My M35 has a strange clunking/crunching sound at low speeds. It doesn't appear to happen at higher speeds (over 40) although I guess it's possible that I just can't hear it. To me it sounds like it's coming from the rear somewhere and also sounds like it is at the same point on the rotation of the wheel. ie whenever the wheel gets close to that same rotational position it clunks. It's been an issue for quite a long time and just haven't got around to working out the problem. Incase the issues are related; I also get chirps constantly (that I assume are from the ATTESA) and a year or so ago I lost my passenger side rear wheel on the highway so there's potential that there was some minor damage from that accident that is slowly getting worse? Any help would be GREATLY appreciated, Thanks,

hey team so car is a '96 S2 R33 gtst, with a Cusco 1-way lsd. Having an issue with a clunkclunkclunk pulsing feeling coming through the car from the rear when driving in a straight line, present between 25-35kph then goes away, and a grindy/vibraty feel between 1-10kph. But, when going through the 25-35kph range under any reasonable acceleration, can't feel any issue present - although goes through that km range very quickly. Things done so far - rebuilt rear driveshafts just recently, thinking this might have been the issue - no change - replaced centre bearing in tailshaft - replaced all wheel bearings with gen nissan - every single bush replaced with poly, and solid diff front bushes At low speed 1-10kph, the grindy feel is the same as you get from normal operation of the lsd when turning, it's just happening when in a straight line, so thinking it could be the plates are worn and not enough initial torque keeping it 'locked'? Measured the plates and all of them measured as worn by 0.05mm but haven't been able to find out any info about cusco lsd's to see what they class as the min thickness, and when to be replaced.

So last weekend I decided to heighten the front coilovers a bit as it turned out the tyres would rub the underside of the guards on certain occasions. So I took them out, raised them up 5mm and bam; problem solved. After doing a test drive I noticed a variety of clunks and occasional noises and now I'm unsure if they have been there all along and I didn't notice as I always run the stereo, or is it to do with the work I just did. I don't believe it to be related to the past weekend work as it was a simple enough process and I put it all back together tightly. Even more confusing is that most of the suspension related parts are in good condition or relatively new. A quick run down... coilovers - around 15,000kms front sway bar - aftermarket, new polyurethane bushes 700kms ago swaybar links- 1300kms old tension rods - solid, 8,000kms steering ends - solid, 8,000kms LCA - standard tower brace I know that a set up like this is conducive to NVH but this is something else. The clunks seem to happen at lower speeds and usually when I'm just minding my business going in a straight line. Its not set off by any specific road conditions or driver inputs. The vibration of the clunk I can even sense through my feet, but I think its coming from both sides. Also there is one from the right rear of the car sometimes too. I did jack each corner of the car up and did a basic check to see if there was any play in the ball joints, but they seem ok. I did notice about an inch of sideways play in the front wheels, equally on both sides, and put this down to normal play in the L/R motion of the steering system (would that be right?) So yeah, I'm kinda concerned as I feel like I have the obvious stuff covered, but that said I don't have much confidence in tracking down these clunks. Has this happened to you? What was it? or what have I overlooked? Thanks!