Can anyone explain to me what the vendors mean when they advertise the trans crossmember as having different drop inches? For example I've seen 2"drop,4" drop, 6"drop, and 8"drop crossmembers and I havent a clue what they're referring to other than the obvious distances in length, but I dont know which is appropriate for my application. Btw, this is in reference to a 98' F-body 4L60E going in my 1980 Caprice thats patiently awaiting its LS1 conversion. Any help is greatly appreciated.