Challenger R/T is the muscle Challenger — JS23 hardtop, JS27 convertible, JS29 hardtop with the SE luxury package layered on top. Standard engine was the 383 N-code Magnum four-barrel, with the U-code 440 Magnum, V-code 440 Six-Pack, and R-code 426 Hemi all on the option sheet. The R/T treatment brought the bumblebee tail stripes (or longitudinal C-stripe), the heavy-duty cooling, and the upgraded brakes that defined the Dodge performance line for 1970.
Designer — Carl Cameron led the Challenger's exterior design under Dodge studio chief William (Bill) Brownlie and corporate design VP Elwood Engel. Cameron's prior credits include the 1966 Dodge Charger; the 1970 Challenger's grille reportedly draws on a stillborn 1966 Charger turbine sketch he had developed earlier. The Challenger does not share exterior sheet metal with the Plymouth Barracuda despite the shared E-platform — its wheelbase is two inches longer, the body five inches longer, and every panel is unique to the Dodge.
T/A Challenger: 1970-only homologation sibling running the 340 Six-Barrel small-block with the AAR 'Cuda's induction logic, side-exit exhaust, fiberglass hood, and M0-prefix sequential. Same plant (Hamtramck) and same 1970-only window.