The Mustang GT features an aluminum block 4.6 L SOHC 3-valve Modular V8 with variable camshaft timing (VCT) that produces 300 hp (224 kW). The 2005 Mustang GT has an approximate weight to power ratio of 11.5 lb/bhp. The base Mustang comes with a standard Tremec T-5 5-speed manual transmission while Ford’s own 5R55S 5-speed automatic, a Mustang first, is optional. Though the Mustang GT features the same automatic transmission as the V6 model, the Tremec T-5 manual is substituted with the heavier duty Tremec TR-3650 5-speed manual transmission to better handle the GT’s extra power.
For 2010, Ford unveiled a redesigned Mustang prior to the Los Angeles International Auto Show. The V6 for base Mustangs remains unchanged, while the Mustang GT’s 4.6 L V8 has been revised to specifications similar to that of the 2008-2009 Mustang Bullitt’s 4.6 L V8, resulting in 315 hp (235 kW) @ 6000 rpm and 325 lb·ft (441 N·m) of torque @ 4250 rpm. Other mechanical features for the 2010 Mustang include new spring rates and dampers to improve ride quality and control, standard traction control system and stability control system on all models, and new wheel sizes. For the Mustang GT, two performance packages were made available. Other new features and options for the 2010 Mustang include Ford SYNC, dual-zone automatic climate control, an updated navigation system with Sirius Travel Link, a capless fuel filler, and a reverse camera system to aid in backing up.