Kenworth T680 vs Peterbilt 579
Below, every figure both makers publish sits side by side, with the Kenworth T680 and the Peterbilt 579 drawn to the same scale from their dimension drawings.
All specifications
Every figure the makers publish. Search for one, or show only those that differ.
Dimensions
Bumper to front axle1.283 mset-back front axleNot published
Front axle to back of cab1.882 m1.882 mFAX to BOC
Bumper to back of cab (day cab)3.165 mstandard hood day cabNot published
Front axle to back of sleeper3.548 m76 in high-roof sleeper, standard hoodNot published
Front axle to rear of roof fairing4.039 m76 in high-roof sleeperNot published
Bumper to back of sleeper4.829 m76 in high-roof sleeper, standard hoodNot published
Bumper to rear of roof fairing5.296 m76 in high-roof sleeperNot published
Front axle to front of tilted hood2.23 mhood tilt clearanceNot published
Tilted hood height above frame2.047 mfrom bottom of frame railNot published
Sleeper roof height above frame3.198 mNot published
Roof fairing height above frame3.238 m76 in high-roof sleeper, top of fairingNot published
Day cab roof height above frame2.129 mNot published
Day cab roof fairing height above frame3.231 mstandard hood day cabNot published
Width over mirrors3.04 mfront view3.063 mFront view
Cab width (front view)2.474 mNot published
Cab width (rear view)2.101 mNot published
Frame width0.864 moutside of frame railsNot published
Bumper to back of cab (BBC)Not published3.15 m124 in BBC; SBFA
Front overhangNot published1.234 m
Front of frame to front axleNot published0.795 mFOF
Cab height above frameNot published2.052 mFrom bottom of frame rail
Cab floor height above frameNot published0.406 mFrom bottom of frame rail
Overall widthNot published2.388 mTop view, excluding mirrors
Bumper to back of cab (118 in BBC variant)Not published2.997 m579-118 SBFA
Front axle to back of cab (118 in BBC variant)Not published1.732 m579-118 SBFA; FAX to BOC
Sleeper roof height above frame (44 in low roof)Not published2.126 m
Sleeper roof height above frame (58 in low roof)Not published2.172 m
Sleeper roof height above frame (58 in high roof)Not published2.586 m
Sleeper roof height above frame (72 in high roof)Not published2.586 m
Sleeper roof height above frame (80 in high roof)Not published2.637 m
Sleeper length (44 in sleeper)Not published0.914 m
Sleeper length (58 in sleeper)Not published1.219 m
Sleeper length (72 in sleeper)Not published1.6 m
Sleeper length (80 in sleeper)Not published1.753 m
Cab-to-sleeper opening height (low roof)Not published1.245 mDimension A, walkthrough opening
Cab-to-sleeper opening width (low roof)Not published1.73 mDimension B, walkthrough opening
Cab-to-sleeper opening height (high roof)Not published1.689 mDimension A, walkthrough opening
Cab-to-sleeper opening width (high roof)Not published1.73 mDimension B, walkthrough opening
Sleeper headroom (80 in UltraLoft)Not published2.438 m
Sleeper storage volume (80 in UltraLoft)Not published1.98 m³
Engine
Engine modelPACCAR MX-1312.9 LPACCAR MX-13, PACCAR MX-11, Cummins X15, Cummins X15N, Cummins ISX12N, Cummins L9N
Displacement12.9 LMX-13Not published
Gross power405-510 hpPACCAR MX-13451 kW (605 hp)Cummins X15, top rating
Max torque1,550-1,850 lb-ftPACCAR MX-132,779 NmCummins X15, top rating
Displacement (PACCAR MX-13)Not published12.9 L
Power (PACCAR MX-13)Not published380 kW (510 hp)
Torque (PACCAR MX-13)Not published2,508 Nm
Displacement (PACCAR MX-11)Not published10.8 L
Power (PACCAR MX-11)Not published332 kW (445 hp)
Torque (PACCAR MX-11)Not published2,305 Nm
Displacement (Cummins X15)Not published15 L
Displacement (Cummins X15N)Not published14.5 L
Power (Cummins X15N)Not published373 kW (500 hp)Maximum rating, up to 500 hp
Torque (Cummins X15N)Not published2,508 NmMaximum rating, up to 1,850 lb-ft
Displacement (Cummins ISX12N)Not published11.9 L
Power (Cummins ISX12N)Not published298 kW (400 hp)Maximum rating, up to 400 hp
Torque (Cummins ISX12N)Not published1,966 NmMaximum rating, up to 1,450 lb-ft
Displacement (Cummins L9N)Not published8.9 L
Power (Cummins L9N)Not published239 kW (320 hp)Single rating
Torque (Cummins L9N)Not published1,356 NmSingle rating
Transmission
TransmissionPACCAR TX-12 automated (with MX-13); PACCAR TX-18 and TX-18 PRO (with MX-11)PACCAR TX-12 PRO automated (engines up to 1,000 lb-ft, GCWR up to 70,000 lb)
Rear axlePACCAR DX-40 tandem axle (with MX-13)Not published
Sleeper optionsNot published44 in to 80 in; 80 in UltraLoft
Transmission (PACCAR TX-12)Not published12-speed automated, on-highway fuel efficiency; 2 reverse; max engine 510 hp / 1,850 lb-ft; max GCWR 110,000 lb; system weight 657 lb (298 kg)
Transmission (PACCAR TX-12 PRO)Not published12-speed automated, extreme-duty clutch; max engine 455 hp / 1,700 lb-ft; max GCWR 70,000 lb; system weight 665 lb (302 kg)
Transmission (PACCAR TX-18)Not published18-speed automated, vocational / heavy haul; max engine 510 hp / 1,850 lb-ft; max operating weight 140,000 lb; system weight 808 lb (367 kg)
Transmission (Endurant HD)Not published12-speed automated, on-highway fuel efficiency
Transmission (Endurant XD)Not published18-speed automated, vocational, heavy haul, high performance
Transmission (Eaton FR/RT)Not publishedManual; 9, 10, 11, 13, 15 or 18 speeds
Transmission (Eaton UltraShift PLUS)Not publishedAutomated; 10, 11, 13 or 18 speeds
Drive axle ratio range (PACCAR DX-40)Not published2.47 to 3.70; 1,650 lb-ft straight torque rating, 1,850 lb-ft multi-torque rating
Weight
Front axle capacityNot published6,622 kg
Rear axle capacityNot published20,865 kg
Front axle capacity (minimum option)Not published5,443 kg
Rear axle capacity (minimum option)Not published9,525 kg
Rear tandem axle rating (PACCAR DX-40)Not published18,144 kgTandem GAWR
Max gross combination weight (PACCAR DX-40 axle)Not published36,287 kgAxle GCW limit
Max operating weight (PACCAR MX-13 engine)Not published63,503 kg
Max operating weight (PACCAR MX-11 engine)Not published49,895 kgEngine maximum operating weight
Max gross combination weight (PACCAR TX-12 transmission)Not published49,895 kgStandard TX-12 limit
Max gross combination weight (PACCAR TX-12 PRO transmission)Not published31,751 kg
Max operating weight (PACCAR TX-18 transmission)Not published63,503 kg
Engine dry weight (PACCAR MX-13)Not published1,134 kg
Engine dry weight (PACCAR MX-11)Not published998 kg
Capacities
Fuel tankNot published568 L
Fuel tank (smallest option)Not published151 L
Fuel tank diametersNot published20 in, 23 in or 26 in
DEF tank (small)Not published38.6 L
DEF tank (medium)Not published60.9 L
DEF tank (large)Not published76.1 L
DEF tank (medium aero)Not published52.6 L
DEF tank (large aero)Not published67.8 L
Service intervals
Engine oil and filterNot published120,000 km
Fifth wheelNot published24,000 kmor monthly: inspect, grease
Axle and gearbox first-fill oilNot publishedfirst change at 3,000-5,000 mi (4,800-8,000 km); level check every 15,000 mi (24,000 km)
Sources: Kenworth Heavy Duty Body Builder Manual, Sept 2024 (T680/T880/W990), section 3 Dimensions · Peterbilt 2024 Heavy Duty Body Builder Manual, Rev A (May 2024), Figure 3-4 Model 579-124 SBFA overall dimensions
Drawn to scale
Side views measured off each maker's dimension drawing, front edges and ground lined up.
Kenworth T680 vs Peterbilt 579: questions
Where do these figures come from?
Each model's own published spec sheet or brochure, linked under the table. Builds differ by market and year, so confirm the figures for a particular machine with its dealer.
Can I rent or buy these machines in the UAE?
Each model's page lists the ones for hire and for sale on EquipmentsFinder now, with typical prices in AED.
