Re: qustion on the differentals.
You can buy a diff. cover with a drain and fill hole. I bought this one from Ford Racing. The part #is M-4033-G1. It has load bolts which provide additional support for the differential bearing caps, increases ring and pinion gear life and strengthens the diff. M-4033-G2 is a lower profile design meant for newer Mustangs which the G1 will have clearance problems with. Both are for the 8.8 differential housing!!!...make sure you have that, not the 7.5. You can order it from a Ford dealer or many performance shops. It looks way better than the stamped steel cover looking at the vehicle from behind.
JBA s.s. headers&exhaust, K&N cold air intake, Bosch Iridium Plus 4 plugs, Royal Purple in motor, 5spd & diff.,Superchips programmer, axle girdle. Also have but yet to install KYB Gas-A-Just shocks and Belltech sway bars.