Friend of mine just picked up a 99 I/S with 64000 miles. Was doing a service on it when I found splines worn about 50%. Unless I can find a rear end guess I'll be rebuilding this one. Even if I can find one I'll still rebuild this one for a spare in case other trouble down the road.
David
Which splines were worn, the drive flange splines or the driven splines. If its the drive flange splines, no need to rebuild the whole final drive unit. If you need a final drive unit check Pinwall.