how can i drop my 85 grand prix from the back so the back bumper could touch the ground i was thinkin about a body drop but i dont know how to do that see i have hydrualics on this car but i would like the back to go way low so it can drag which i ran into 2 problems the gas tank hits first before the bumper hits and now that i got hydros not even tha tank hits how can it go lower with tha hydros and how can i fix tha gas tank problem i was thinkin adding a fuel cell but not any ideas?