>I had the rear diff & transmission fluid changed for Redline MTL a few >months ago. They've been leaking ever since. Did you use the same fluid in both units? Tranny takes MT-90 GL4 and rear diff takes 75w90 GL5. I've had these in for about 2 years and haven't leaked a drop (I'm whispering this quietly so the car can't hear me). Wayne Dohnal 1994 S4