Diesel 12 Speed Trucks For Sale

Featured Item

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2019 Freightliner Cascadia 126 Sleeper Semi Truck - 72" Mid Roof Sleeper, Detroit 450HP, 12 Speed Dt12 Automatic

$44,950 USD

Ready to hit the road and go to work! First Class 8 Truck Sales is a full-service dealer offering high quality equipment, premium financing options, and an excellent customer experience....

Condition	Used
Usage	567,537 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	450 HP
Engine Model	Detroit DD13
Drivetrain	6x4
Transmission	12 Speed Detroit DT12 Automatic
Sleeper Type	Mid Roof Sleeper
Sleeper Size	72"
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 3.08 ratio
Stock Number	346
MLS Number	13542957
Category	Sleeper Semi Trucks
Last Updated	7/19/2025
Location	Belvidere, IL, US
Sold By	First Class 8 Truck Sales

Featured Item

19 0

2020 Freightliner Cascadia 126 Sleeper Semi Truck - 72" Raised Roof Sleeper, Detroit 455HP, 12 Speed Dt12 Automatic

$36,500 USD

Ready to hit the road and go to work! First Class 8 Truck Sales is a full-service dealer offering high quality equipment, premium financing options, and an excellent customer experience....

Condition	Used
Usage	670,003 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	455 HP
Engine Model	Detroit DD15
Drivetrain	6x4
Transmission	12 Speed Detroit DT12 Automatic
Sleeper Type	Raised Roof Sleeper
Sleeper Size	72"
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 3.08 ratio
Stock Number	344
MLS Number	13542058
Category	Sleeper Semi Trucks
Last Updated	7/19/2025
Location	Belvidere, IL, US
Sold By	First Class 8 Truck Sales

Featured Item

19 0

2019 Freightliner Cascadia 126 Sleeper Semi Truck - 72" Raised Roof Sleeper, Detroit 455HP, 12 Speed Dt12 Automatic

$34,950 USD

First Class 8 Truck Sales is a full-service dealer offering high quality equipment, premium financing options, and an excellent customer experience. Call, click, or stop by and visit us...

Condition	Used
Usage	665,832 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	455 HP
Engine Model	Detroit DD15
Drivetrain	6x4
Transmission	12 Speed Detroit DT12 Automatic
Sleeper Type	Raised Roof Sleeper
Sleeper Size	72"
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 3.08 ratio
Stock Number	342
MLS Number	13523794
Category	Sleeper Semi Trucks
Last Updated	7/19/2025
Location	Belvidere, IL, US
Sold By	First Class 8 Truck Sales

Featured Item

18 0

2020 Freightliner Cascadia 126 Sleeper Semi Truck - 72" Raised Roof Sleeper, Detroit 455HP, 12 Speed Dt12 Automatic

Price Drop

$37,500 USD

Ready to hit the road and go to work! First Class 8 Truck Sales is a full-service dealer offering high quality equipment, premium financing options, and an excellent customer experience....

Condition	Used
Usage	641,213 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	455 HP
Engine Model	Detroit DD15
Drivetrain	6x4
Transmission	12 Speed Detroit DT12 Automatic
Sleeper Type	Raised Roof Sleeper
Sleeper Size	72"
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 3.08 ratio
Stock Number	323
MLS Number	13441124
Category	Sleeper Semi Trucks
Last Updated	7/19/2025
Location	Belvidere, IL, US
Sold By	First Class 8 Truck Sales

(888) 493-___ SHOW
NUMBERCall Seller

Featured Item

27 1

2022 Peterbilt 579 Sleeper Semi Truck

Price Drop

$79,900 USD

2022 Peterbilt 579 – Road Ready and Fleet Friendly! Stock1272928, Looking for late-model trucks that are driver-preferred and ready to roll? Check out our 2022 Peterbilt 579 units, built...

Quantity	6
Condition	Used
Usage	424,000 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	400 HP
Engine Model	Cummins X15
Drivetrain	6x4
Transmission	12 Speed Endurant Automated
Sleeper Type	Unibilt
Sleeper Size	80"
Suspension	Flex Air
Rear Axle	Tandem Axle
Rear End	40,000 lb 2.79 ratio
Stock Number	1272928
MLS Number	13503970
Category	Sleeper Semi Trucks
Last Updated	7/19/2025
Location	Atlanta, GA, US
Sold By	Rush Truck Centers Atlanta

Featured Item

19 0

2019 Freightliner Cascadia 126 Sleeper Semi Truck - 72" Raised Roof Sleeper, Detroit 455HP, 12 Speed Dt12 Automatic

Price Drop

$37,500 USD

First Class 8 Truck Sales is a full-service dealer offering high quality equipment, premium financing options, and an excellent customer experience. Call, click, or stop by and visit us...

Condition	Used
Usage	625,682 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	455 HP
Engine Model	Detroit DD15
Drivetrain	6x4
Transmission	12 Speed Detroit DT12 Automatic
Sleeper Type	Raised Roof Sleeper
Sleeper Size	72"
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 3.08 ratio
Stock Number	336
MLS Number	13483776
Category	Sleeper Semi Trucks
Last Updated	7/19/2025
Location	Belvidere, IL, US
Sold By	First Class 8 Truck Sales

(256) 605-___ SHOW
NUMBERCall Seller

Featured Item

29 1

2023 International LT 500k MILE WARRANTY

$74,830 USD

*FACTORY 500K MILE WARRANTY ON ENGINE CUMMINS X15 450 HP EATON ENDURANT 12SPEED AUTO NEW STEER TIRES NEW FILTERS/FLUIDS 100 GAL ALUMINUM FUEL TANKS BENDIX COLLISION SYSTEM 187IN...

Warranty

Condition	Used
Usage	89,350 Miles
Duty Class	Heavy Duty Day Cab Truck
Horse Power	450 HP
Engine Model	Cummins X15
Drivetrain	6x4
Transmission	12 Speed Endurant Automated
Rear Axle	Tandem Axle
MLS Number	13661630
Category	Day Cab Semi Trucks
Last Updated	6/23/2025
Location	FYFFE, AL, US
Sold By	Hill Automotive

(855) 981-___ SHOW
NUMBERCall Seller

Featured Item

10 0

2023 Volvo VNL64T760 Sleeper Semi Truck - 70" Raised Roof Sleeper, D13 425HP, 12 Speed I Shift Amt

$95,000 USD

2023 Volvo VNL64T760, SPECS: - Drive: 6x4, - 70" High Roof, - Double Bunk, - Engine: D13, - Horsepower: 425, - Transmission: VOLVO I-SHIFT ATO2612F, 12 SPEED, - APU: None, - Wheels:...

Condition	Used
Usage	315,541 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	425 HP
Engine Model	Volvo D13
Drivetrain	6x4
Transmission	12 Speed I Shift Automated
Sleeper Type	Raised Roof Sleeper
Sleeper Size	70"
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	38,000 lb 1.27 ratio
Stock Number	NHSA23VNL6DTX Web
MLS Number	13651909
Category	Sleeper Semi Trucks
Last Updated	7/15/2025
Location	Dallas, TX, US
Sold By	Nationwide Haul

(855) 981-___ SHOW
NUMBERCall Seller

Featured Item

8 0

2023 Volvo VNL64T760 Sleeper Semi Truck - 70" Raised Roof Sleeper, D13 425HP, 12 Speed I Shift Amt

$90,000 USD

2023 Volvo VNL64T760, SPECS: - Drive: 6x4, - 70" High Roof, - Double Bunk, - Engine: D13, - Horsepower: 425, - Transmission: VOLVO I-SHIFT ATO2612F, 12 SPEED, - APU: None, - Wheels:...

Condition	Used
Usage	399,760 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	425 HP
Engine Model	Volvo D13
Drivetrain	6x4
Transmission	12 Speed I Shift Automated
Sleeper Type	Raised Roof Sleeper
Sleeper Size	70"
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	38,000 lb 1.27 ratio
Stock Number	NHSA23VNL3CNC Web
MLS Number	13651902
Category	Sleeper Semi Trucks
Last Updated	7/15/2025
Location	Charlotte, NC, US
Sold By	Nationwide Haul

(833) 300-___ SHOW
NUMBERCall Seller

Featured Item

38 1

2020 Peterbilt 579 Day Cab Truck - Paccar 455HP, 12 Speed Amt

Call for price

217229 Miles, 6671 Hours, Engine: PACCAR MX-13, 455 HP, Fuel Type: Diesel, 12 Speed AMT Transmission, Drive: 6x4, Paccar Suspension, Tires: 11R22.5, Wheels: Aluminum, Wheel Base: 188, Tandem...

Condition	Used
Usage	6,671 Hours
Duty Class	Heavy Duty Day Cab Truck
Horse Power	455 HP
Engine Model	Paccar MX-13
Drivetrain	6x4
Transmission	12 Speed Automated
Suspension	Paccar
Rear Axle	Tandem Axle
Rear End	40,000 lb 3.25 ratio
Stock Number	C-36531
MLS Number	13651856
Category	Day Cab Semi Trucks
Last Updated	6/27/2025
Location	Montreal/ Ile-aux-noix/Toronto/NY, QC, Canada
Sold By	Gamache Truck Center

(833) 444-___ SHOW
NUMBERCall Seller

Featured Item

37 0

2022 Peterbilt 579 Day Cab Tractor

$32,500 USD

2022 Peterbilt 579 Day Cab Tractor, Paccar MX-13 Diesel Engine, 12.9 Liters, 405 HP, PO-16F112C 12-Speed Automated Transmission, Air Ride Suspension, GVWR 34,700 Lbs, Front Axle 12,000 Lbs,...

Condition	Used
Usage	181,163 Miles
Duty Class	Heavy Duty Day Cab Truck
Horse Power	380 HP
Engine Model	Paccar MX/MX-13
Drivetrain	4x2
Transmission	12 Speed
Suspension	Air Ride
Rear End	22,700 lb
Stock Number	9687
MLS Number	13269412
Category	Day Cab Semi Trucks
Last Updated	7/1/2025
Location	Sparta, KY, US
Sold By	Craigmyle Truck and Trailer Sales

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2020 Freightliner T12664ST Sleeper Semi Truck - 72" Integral Sleeper, 455HP, 12 Speed Automatic

Recently Updated

$52,000 USD

MANAGERS SPECIAL;Representative Photos of 20+ Unit fleet Purchase your vehicle from the leader in the leasing industry. Penske vehicles have the reputation of quality and being...

Condition	Used
Usage	618,016 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	455 HP
Engine Model	DD15AT
Transmission	12 Speed Automatic
Sleeper Type	Integral Sleeper
Sleeper Size	72"
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 3.08 ratio
Stock Number	373484
MLS Number	12379442
Category	Sleeper Semi Trucks
Last Updated	7/20/2025
Location	Newnan, GA, US
Sold By	Penske Used Trucks

28 0

2020 International LT625 Sleeper Semi Truck - 73" Integral Sleeper, Cummins 450HP, 12 Speed Automatic

Price Drop

$43,500 USD

SPECIAL PROMOTION - Original Price: $48500.00 Purchase your vehicle from the leader in the leasing industry. Penske vehicles have the reputation of quality and being well-maintained. We...

Condition	Used
Usage	496,914 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	450 HP
Engine Model	Cummins X15
Transmission	12 Speed Automatic
Sleeper Type	Integral Sleeper
Sleeper Size	73"
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 3.08 ratio
Stock Number	356887
MLS Number	12442515
Category	Sleeper Semi Trucks
Last Updated	7/20/2025
Location	Indian Trail, NC, US
Sold By	Penske Used Trucks

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2020 Freightliner Cascadia 126 Day Cab Truck - 435HP, 12 Speed Automatic

Recently Updated

$51,500 USD

Purchase your vehicle from the leader in the leasing industry. Penske vehicles have the reputation of quality and being well-maintained. We offer competitive financing; extended warranties;...

Condition	Used
Usage	423,462 Miles
Duty Class	Heavy Duty Day Cab Truck
Horse Power	435 HP
Engine Model	DD13
Transmission	12 Speed Automatic
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 3.08 ratio
Stock Number	354797
MLS Number	13489409
Category	Day Cab Semi Trucks
Last Updated	7/20/2025
Location	Piqua, OH, US
Sold By	Penske Used Trucks

18 0

2020 Volvo VNL64300 Day Cab Truck - 455HP, 12 Speed Automatic

Recently Updated

$46,750 USD

MANAGERS SPECIAL Purchase your vehicle from the leader in the leasing industry. Penske vehicles have the reputation of quality and being well-maintained. We offer competitive financing;...

Condition	Used
Usage	415,430 Miles
Duty Class	Heavy Duty Day Cab Truck
Horse Power	455 HP
Engine Model	D13
Transmission	12 Speed Automatic
Sleeper Size	0"
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 3.08 ratio
Stock Number	354923
MLS Number	13562361
Category	Day Cab Semi Trucks
Last Updated	7/20/2025
Location	Middlefield, OH, US
Sold By	Penske Used Trucks

18 0

2020 Freightliner Cascadia 125 Day Cab Truck - 435HP, 12 Speed Automatic

Recently Updated

$45,000 USD

Purchase your vehicle from the leader in the leasing industry. Penske vehicles have the reputation of quality and being well-maintained. We offer competitive financing; extended warranties;...

Condition	Used
Usage	356,971 Miles
Duty Class	Heavy Duty Day Cab Truck
Horse Power	435 HP
Engine Model	DD13
Transmission	12 Speed Automatic
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 3.08 ratio
Stock Number	283570
MLS Number	13071251
Category	Day Cab Semi Trucks
Last Updated	7/20/2025
Location	Bethlehem, PA, US
Sold By	Penske Used Trucks

18 0

2020 Freightliner Cascadia 126 Day Cab Truck - 435HP, 12 Speed Automatic

Recently Updated

$54,500 USD

Purchase your vehicle from the leader in the leasing industry. Penske vehicles have the reputation of quality and being well-maintained. We offer competitive financing; extended warranties;...

Condition	Used
Usage	312,889 Miles
Duty Class	Heavy Duty Day Cab Truck
Horse Power	435 HP
Engine Model	DD13
Transmission	12 Speed Automatic
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 3.08 ratio
Stock Number	337608
MLS Number	12891807
Category	Day Cab Semi Trucks
Last Updated	7/20/2025
Location	Holland, MI, US
Sold By	Penske Used Trucks

4 0

2020 Freightliner Cascadia 126 Sleeper Semi Truck - 72" Mid Roof Sleeper, Detroit 505HP, 12 Speed Dt12 Amt

Newly Listed

$47,500 USD

72 Inch Mid-Roof XT Sleeper, 587,000 Approximate Miles, ECM Reads 439,000 Miles, Detroit DD15 Engine, 505 H.P., Engine Brake, DT12 Transmission, (Automatic), 40,000 Lb. Rear Ends, 3.08 Ratio...

Condition	Used
Usage	587,000 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	505 HP
Engine Model	Detroit DD15
Drivetrain	6x4
Transmission	12 Speed Detroit DT12 Automated
Sleeper Type	Mid Roof Sleeper
Sleeper Size	72"
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 3.08 ratio
Stock Number	LJ3601
MLS Number	13712709
Category	Sleeper Semi Trucks
Last Updated	7/20/2025
Location	Monroe, GA, US
Sold By	AAA Trucks LLC

4 0

2020 International LT Sleeper Semi Truck - 56" Mid Roof Sleeper, A26 400HP, 12 Speed Endurant Amt

Newly Listed

Call for price

56 Inch Hi-Rise Sleeper, 318,000 Approximate Miles, ECM Reads 318,000 Miles, Navistar A26 Engine, 400 H.P., Engine Brake, Automatic Transmission, 40,000 Lb. Rear Ends, 3.67 Ratio, Air Ride...

Condition	Used
Usage	318,000 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	400 HP
Engine Model	International A26
Drivetrain	6x4
Transmission	12 Speed Endurant Automated
Sleeper Type	Mid Roof Sleeper
Sleeper Size	56"
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 3.76 ratio
Stock Number	545768
MLS Number	13712706
Category	Sleeper Semi Trucks
Last Updated	7/20/2025
Location	Monroe, GA, US
Sold By	AAA Trucks LLC

4 0

2020 International LT Sleeper Semi Truck - 56" Mid Roof Sleeper, A26 400HP, 12 Speed Endurant Amt

Newly Listed

Call for price

56 Inch Hi-Rise Sleeper, 359,000 Approximate Miles, ECM Reads 359,000 Miles, Navistar A26 Engine, 400 H.P., Engine Brake, Automatic Transmission, 40,000 Lb. Rear Ends, 3.67 Ratio, Air Ride...

Condition	Used
Usage	359,000 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	400 HP
Engine Model	International A26
Drivetrain	6x4
Transmission	12 Speed Endurant Automated
Sleeper Type	Mid Roof Sleeper
Sleeper Size	56"
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 3.67 ratio
Stock Number	539698
MLS Number	13712705
Category	Sleeper Semi Trucks
Last Updated	7/20/2025
Location	Monroe, GA, US
Sold By	AAA Trucks LLC

4 0

2020 International LT Sleeper Semi Truck - 56" Mid Roof Sleeper, A26 400HP, 12 Speed Endurant Amt

Newly Listed

Call for price

56 Inch Hi-Rise Sleeper, 343,000 Approximate Miles, ECM Reads 343,000 Miles, Navistar A26 Engine, 400 H.P., Engine Brake, Automatic Transmission, 40,000 Lb. Rear Ends, 3.67 Ratio, Air Ride...

Condition	Used
Usage	343,000 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	400 HP
Engine Model	International A26
Drivetrain	6x4
Transmission	12 Speed Endurant Automated
Sleeper Type	Mid Roof Sleeper
Sleeper Size	56"
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 3.67 ratio
Stock Number	538940
MLS Number	13712704
Category	Sleeper Semi Trucks
Last Updated	7/20/2025
Location	Monroe, GA, US
Sold By	AAA Trucks LLC

4 0

2019 Freightliner Cascadia 126 Sleeper Semi Truck - 76" Raised Roof Sleeper, Detroit 455HP, 12 Speed Dt12 Amt

Newly Listed

$46,900 USD

72 Inch Raised Roof Sleeper, Upper Bunk, 606,000 Approximate Miles, ECM Reads 606,000 Miles, Detroit DD15 Engine, 455 H.P., Engine Brake, DT12 Transmission, (Automatic), 40,000 Lb. Rear Ends...

Condition	Used
Usage	606,000 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	455 HP
Engine Model	Detroit DD15
Drivetrain	6x4
Transmission	12 Speed Detroit DT12 Automated
Sleeper Type	Raised Roof Sleeper
Sleeper Size	76"
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 2.85 ratio
Stock Number	KG4359
MLS Number	13712701
Category	Sleeper Semi Trucks
Last Updated	7/20/2025
Location	Monroe, GA, US
Sold By	AAA Trucks LLC

4 0

2019 Kenworth T680 Sleeper Semi Truck - 76" Raised Roof Sleeper, Cummins 450HP, 12 Speed Endurant Amt

Newly Listed

$40,900 USD

76 Inch High-Roof Sleeper, Upper Bunk, 575,000 Approximate Miles, ECM Reads 575,000 Miles, Cummins X15 Engine, 450 H.P., Engine Brake, Eaton Fuller Endurant 12 Speed Transmission,...

Condition	Used
Usage	575,000 Miles
Duty Class	Heavy Duty Sleeper Semi Truck
Horse Power	450 HP
Engine Model	Cummins X15
Drivetrain	6x4
Transmission	12 Speed Endurant Automated
Sleeper Type	Raised Roof Sleeper
Sleeper Size	76"
Suspension	Air Ride
Rear Axle	Tandem Axle
Rear End	40,000 lb 2.79 ratio
Stock Number	242445
MLS Number	13712697
Category	Sleeper Semi Trucks
Last Updated	7/20/2025
Location	Monroe, GA, US
Sold By	AAA Trucks LLC