go buy 2 or 3 cans of engine de greaser, put the car on ramps and spray it down from under the car, hit the rack, tranny bottom of the engine, the sides of the block, the whole nine yards, then do the top.
once its clean, see whats really leaking before you invest in a rack, and the time to do one. your rear valve cover can leak on the tranny then off the tranny pan then hit the rack while driving making it all wet looking back there.
just trying to look out for ya. and who wants to work on a car thats all greasy any ways?