My 1996 RMW with limited slip diff clunks and bangs alarmingly on corners, fast or slow, tight or wide, forward or back. I plan to drain the diff and clean it and replace the lube with Amsoil gear lube and add Amsoil SlipLock, which is supposed to fix things, but I know nothing. Should I dredge out all the goop I expect to see in the diff? Can I/should I use some kind of spray or solvent to remove every last bit of stuff from the cogs and the housing? Especially, I read here years ago that there's an issue with the OEM gasket, maybe something about it not letting the lube go into the axles, but I forget. All wisdom appreciated.