- Engine
- 426 cu in (7.0L) Chrysler Street Hemi V8 with dual Carter AFB four-barrel carburettors
- Power
- 425 hp / 490 lb-ft gross (widely understood as materially understated in period)
- Transmission
- TorqueFlite 727 three-speed automatic (the volume fit) or A833 four-speed manual (rarer across every body configuration)
- Layout
- Front-engined, rear-wheel drive, E-body unibody. Hardtop, SE hardtop with vinyl roof and formal backlight, or convertible (convertible 1970 only)
- Top speed
- ~135–145 mph / ~217–233 km/h depending on drivetrain and gearing
- 0–60 mph
- ~5.6 s (four-speed); ~5.8 s (automatic)
- Production
- Approximately 427 cars across two model years: 356 in 1970 (287 hardtop / 60 SE hardtop / 9 convertible) and 71 in 1971 (hardtop only)
- Assembly
- Chrysler Hamtramck Assembly, Detroit, Michigan
- Model-year note
- 1971 was the final year the 426 Street Hemi was offered in the Challenger; the convertible body was withdrawn from the Hemi R/T line for 1971