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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
Both the GT and the factory equiped 5.0 LX have the same drive line and brakes and suspension. When referring to the "notch/trunk model" vs the hatch model you save wieght because the hatch car has extra reinforcing in it for the hatch to bolt to along with the extra weight of the hatch. Then you add the GT(hatch car only) and all the cosmetic ground effects you make the car a little fatter again. The GT is also victim of more wind drag. That is why in 93 on the Cobra model Ford placed a slash cut rear bumber cover on it to get rid of the parachute effect the original GT bumper cover created. In all, a notch back 5.0 Mustang would be the quicker of the three models when you add weight and wind drag into the eqaution.