does anyone know what fluid/grease do you use between the plates??

http://www.locostbuilders.co.uk/viewthread.php?tid=174126

The fluid is a silicone based fluid that thickenss when heated. I had a sierra cosworth diff pumped by Phil Jones Engines & transmisions in Chipping Sodbury (see website). It works well but I now run a 4.4 with a titan diff as the viscous was not good enough on a hillclimb MK. Perfect for a road car as plate type can push front out in tight corners if throttle is planted to soon.

thank you! how much did it cost you?