I have an R200 clutch LSD, it is making a strange noise that gets louder when I go faster. I sounds like metal sliding across metal. It is not a scratching or screatching sound but more like a sliding sound something like schhhhhh.... The lsd action still works, it hooks up well with street tires but I have not used it with the race tires as I do not have a race until April the 24th. Do you think it is the friction plates and disks? Please help.

I've never opened a R200/R180 clutch style LSD. From LSD experiences using other makes I think it might be low lube levels or the clutch pack has seen better days. Are you sure the noise is internal? It could be something jambed up in the suspension rubbing the rotational parts or brake problems. Just a thought....

I have not checked the brakes yet, I just put the car back together and double checked everything, I could have something wrong somewhere I guess. I just put this differential in for the first time, I go it used so I am a little worried about it.

If it's brand spanking new you need to get some lube into the clutch packs. Put LSD additive in the oil if it doesn't already have it, then go do some figure 8s in a parking lot until the lube gets in there.

Everything checks out on the car as far as brakes or anything rubbing. I just drove the car for the last 45 minutes and did some figure 8's but the sound is still there. I have 1.5 Quarts of fluid in the case including 4oz of friction modifier. Does that sound like the right amount? I have never had a differential that whined from the gears being too close so I don't know what that sounds like, maby that is the problem here because the LSD works very well. I can drive in tight circles all day and the wheels will spin indipendantly but if I hit the gas they will spin together and the rear will shoot out (I could not resist going around once). On loose gravel it stays locked too so it seems to have a decent amount of break away torque.

Another 4 oz bottle won't hurt anything.

If you want to try and diagnose the noise:

http://www.ringpinion.com/content/technicalhelp/default.asp?pid=109

http://www.ringpinion.com/content/technicalhelp/default.asp?pid=110

I'll get another bottle and put it in. Thanks for the web site it has some helpful info.