The mid-level Challenger R/T is powered by a Hemi V8 coupled to a 5-speed automatic transmission or a Tremec TR-6060 6-speed manual transmission. On cars equipped with the automatic transmission, the engine features the Multi-Displacement System and is rated at (SAE) and torque. With the 6-speed manual transmission, the Multi-Displacement System option was deleted and the engine is rated at (SAE) and torque. Another feature was the Intelligent Deceleration Fuel Shut-Off (iDFSO) available for the automatic models only. The first to combine both a Multi-Displacement system and fuel shut-off. The final drive ratio was 3.06:1 on cars with the automatic transmission, 3.73:1 on cars with the 6-speed manual and wheels or 3.92:1 with the 6-speed manual and optional wheels. Also available on R/T was the "Track Pak" option group, which includes the Tremec manual transmission, a limited slip differential and self-leveling rear shock absorbers.