but are not Mach 1's by VIN code. All first-generation Mach 1's are distinguished by the body style code 63C on the door data plate. The Mach 1 started with a V8-powered SportsRoof body and added visual and performance-enhancing items such as matte black hood treatment with hood pins, hood scoop (including optional Shaker scoop), competition suspension, chrome pop-open gas cap, revised wheels with Goodyear Polyglas tires, chrome exhaust tips (except 351W 2V), deluxe interior, livery and dealer optional chin spoiler, rear deck spoiler, and rear window louvers (SportSlats). Standard equipment was a 351 cu in (5.8 L) Windsor (351W) 2V engine with a 3-speed manual transmission, and a 28 spline open rear axle. A 351W 4V was optional as was a 390 cu in (6.4 L) FE, and the 428 cu in (7.0 L) Cobra Jet 4V with or without Ram Air, and even the introduction of the "drag pack" option with the modified 428 cu in (7.0 L) Super Cobra Jet engine. A 4-speed manual or 3-speed FMX (small block)/C6 (big block) automatic transmission was optional, and the 428SCJ added a cast iron tailshaft in place of the regular aluminum one to the C6. A "traction lok" rear axle was optional, and the 428 CJ/SCJ included a "traction lok" with a 3.91 or 4.30 ratio, 31 spline axle shafts, and a nodular case. In 1970, the 3.91 ratio was a "traction-lok", while the 4.30 ratio was a Detroit Locker. Mach 1s came with upgraded suspension to varying degrees dependent upon powertrain choices. Big block cars had front shock tower reinforcement, thicker sway bars (no rear bar for 1969), and heavier springs and shocks. 428 CJ/SCJ 4-speed cars also came with staggered rear shocks. Standard on Mach 1s was a fierce but cosmetic hood scoop that had integrated turn-signal lights mounted in the back. A more functional option was the signature "Shaker hood", an air scoop mounted directly to the top of the engine, used to collect fresh air and so named for its tendency to "shake" with the V8 engine. The interior came complete with teak wood grain details, full sound-deadening material, and high-back sport bucket seats. In 1968 racecar drivers Mickey Thompson and Danny Ongais took three Mach 1 Mustangs to the Bonneville salt flats for a feature in Hot Rod magazine, in the process setting 295 speed and endurance records over a series of 500-mile and