2027 PETERBILT 579

2027

11 mi

New

VD 836593

This 2026 Peterbilt 579 sleeper tractor pairs a 455 HP PACCAR MX-13 engine with a PACCAR TX-12 automated 12-speed transmission for efficient long-haul performance. Riding on a tandem 40,000 lb rear axle with a 2.85 ratio and 52,000 lb GVWR, it's built for general freight service. The 80" UltraLoft sleeper features a Prestige interior, second bunk, and refrigerator for extended trips. Coverage includes a 2-year/250,000-mile PACCAR MX engine warranty. Contact us to learn more about this unit. Overview This 2026 Peterbilt 579 conventional sleeper tractor rides on an 80" UltraLoft sleeper and is configured for general freight service with a tandem rear axle. Trailer application is specced for 53' vans. Engine & Drivetrain PACCAR MX-13 engine rated 455 HP @ 1600 RPM (governed 2200 RPM) with 1,650 lb-ft of torque @ 900 RPM, 2024-emissions compliant, model year 2026 engine. Paired with a PACCAR TX-12 PO-16F112C12 automated 12-speed transmission (no cooler), column-mounted shifter on the RH side, economy shift calibration, and neutral coast mode. RPL20 interaxle driveline and RPL25 SD driveline with 1 midship bearing. Rear axle ratio is 2.85, with a typical operating speed and VSL setting of 65 MPH. Equipped with a predictive cruise control package, powertrain optimized for fuel economy, and powertrain protect torque limiting. PACCAR compression (engine) brake with controls on the RH column. Electrical package includes a PACCAR 160-amp brushed alternator, PACCAR premium starter, 3 PACCAR premium 12V dual-purpose batteries (2,190 CCA), and a low voltage disconnect system. Also equipped with a variable speed direct-drive fan clutch, WABCO 25.9 CFM air compressor, high-efficiency cooling system, PACCAR fuel/water separator with extended service interval, and an immersion-type block heater (110-120V). Single RH horizontal exhaust with DPF/SCR under cab (single module) and a DPF regeneration switch. Chassis & Axles Front axle: Meritor MFS+12E rated 12,500 lbs with a 3.5" drop, taper leaf springs and shocks rated 12,000 lbs, Tenneco shocks, Meritor Wide Track, and 30mm front spring spacer blocks. Rear axle: PACCAR DX-40 rated 40,000 lbs, tandem configuration. GAWR is 12,000 lbs front and 20,000 lbs / 20,000 lbs on the tandem, with a 52,000 lb GVWR and 80,000 lb GCW. Wheelbase measures 240" (FAX/BOC 68.2", cab/axle 171.8", cab/EOF 227.8"), with a maximum grade rating of 6%. Frame consists of 10-5/8" steel rails (326"-384") at 5/16" thickness with aluminum crossmembers and a tapered EOF with kingpin cutout. Steering is TRW THP60 power steering with a frame-mounted reservoir. Braking includes Bendix ADB22X-LT disc brakes front and rear, ABS 6S6M, and a pneumatic park brake. Safety systems include Bendix ESP electronic stability program with ATC, adaptive cruise control (adjustable/standard following distance), Bendix Fusion stop and auto-go advanced, a collision mitigation sensor, and tire pressure monitoring. PHP10 aluminum preset+ hubs (air disc) front and rear, with synthetic axle lubricant throughout. Fifth wheel is a Jost JSK37 top plate, inboard-mounted on an 18" air slide with LH release, set at 6.6"-7" height on the centerline of the bogie. PolyArmor black quarter fenders with Peterbilt logo, PB rear mudflaps on a 45-degree FleetEng FB27 hanger (painted), and a frame-mounted deck plate/access package on the LH side. Total estimated chassis weight is 16,636 lbs (engineering estimate, excludes unpublished options). Suspension PB low air leaf rear suspension rated 40,000 lbs with a 52" spread, lightweight configuration, plus a dash-mounted dump switch with suspension indicator light. Cab & Interior Aero 118 BBC aluminum cab with Metton hood. 80" UltraLoft sleeper with Prestige interior in Sterling Gray, including cab and sleeper-specific thermal insulation packages. Sleeper features a coil spring mattress, second bunk with ladder, walkthrough curtain, wardrobe and tower cabinet shelving, a cabinet door/drawer package, RH baggage door, LH full-height access door with tilting window, RH sleeper side tilting window, and a 1.8 ft³ refrigerator. Seating includes Peterbilt LX premium driver and passenger seats, air ride driver seat, high-back design, and RH/LH armrests. Multi-function steering wheel with PB logo, audio, and cruise controls on a tilt/telescoping column. One-piece curved windshield with privacy curtain, vanity mirrors on sunvisors, and a painted composite outside sunvisor. Power door locks and power windows, plus a power door lock on the sleeper. D2 fuel-fired sleeper heater with digital controller and a combo fresh air heater/air conditioner. Peterbilt aero mirrors, motorized and heated with integrated convex lenses in body-color housing, plus a look-down mirror and black-housing rectangular hood mirrors. Infotainment includes a ConcertClass AM/FM radio with weatherband and aux input, satellite radio, standard speaker packages for cab and sleeper, Bluetooth phone/audio, USB and dual USB charging ports, a Cobra 29 CB radio with antenna, rear sleeper audio controls, a 12V power outlet, and TV provisions (antenna, wiring, bracket). A 15" digital cluster display houses engine oil temperature, air filter restriction, brake application air pressure, suspension air pressure, engine hourmeter, turbo boost, and engine percent torque gauges. Equipped with global telematics hardware, SmartLINQ remote diagnostics (5-year subscription), wiring provisions for F/O telematics and F/O ELD telematics, and fuel provisions for an F/O APU mounted RH under the sleeper. Also includes electric windshield wipers with intermittent feature, auto reset circuit protection, a UL-listed ABC fire extinguisher, and a triangle reflector kit. Body & Equipment Dual aluminum fuel tanks: 135-gallon RH BOC and 110-gallon LH BOC, both 26", with center fill, dual shutoff valves (dual draw/return), 3 straps per tank, and anti-siphon devices. 20-gallon aero medium DEF tank mounted LH BOC (DEF-to-fuel ratio 1:1-2:1). Aero aluminum battery box (LH under cab) and an aluminum non-slip cab entry step. Aero bumper (molded 3-piece, painted body color), chassis aero fairings, LH/RH fairings from quarter fender to BOS, front tire closeouts, A-pillar fairing, EPIQ aero package to BOS, and aero closeout under the cab/sleeper sides. Sleeper side extenders include 3" rubber flares and 18" extensions. Removable bugscreen behind the grille. Lighting package includes composite fender-mounted headlights with integral DRL/park/turn/side marker, 5 aero LED marker lights, daytime running lights, self-canceling turn signals, LED oval stop/turn/tail/backup lights, and 2 LED load lights flush-mounted mid-inboard BOS, plus an underhood-mounted air horn. Air system includes a Bendix AD-HF air dryer with heater and coalescing filter, steel painted air tanks, nylon chassis hose, a dash-mounted self-returning brake hand valve, 12' AE lines (3-in-1) with dual 7-way plugs and BOC socket, and gladhands/ISO holder mounted BOC/BOS. Finished in two-stage Axalta White across the cab, hood, sleeper, fenders, roof panels, bumper, and chassis fairings, with a Black frame. Tires & Wheels Front tires: Yokohama 16-ply 295/75R22.5 RY023. Rear tires: Yokohama 16-ply 295/75R22.5 TY517 MC2, tandem (8 rear tires). Front and rear wheels: Accuride 22.5x8.25 aluminum, standard polish finish. Warranty & Protection PACCAR MX standard coverage of 2 years / 250,000 miles (400,000 km) / 6,250 hours. Peterbilt Class 8 standard coverage of 1 year / 100,000 miles (160,000 km). Emissions warranty of 5 years / 100,000 miles.

455 HP

PACCAR

MX-13

Diesel

Automated

PACCAR

12 Spd

2.85

6x4

Air Leaf

Tandem

Class 8: 33,001 pounds or greater

12,500 lb

40,000 lb

295/75R22.5

100

240 in

Left Hand Drive

Raised Roof Sleeper

1

Yes

Yes

New

Vinyl/Cloth

Yes

White

Conventional