You will need 1 1/2 quarts of Mopar fluid and 4 oz of modifier. Here's an installation hint that will save you a big mess. Get a 18 in. length of clear Tygon 3/8 in. O.D. hose and slip it over the provided spout for both the fluid and the modifier. Just squeeze the bottle to put it in. Getting the fluid out of the differential is another problem that can be fixed with a drain plug. E-mail me for the write-up or search for the post about 3 weeks ago on this site. Jerry Scott [CO]