JJ Engine Parts
Freightliner Cascadia Air Slide Switch A12-26539-008
$25.00Unit price /Unavailable- Sold out
JJ Engine Parts
Freightliner Cascadia OEM OPT Optional Switch A06-90129-001
$19.99Unit price /Unavailable JJ Engine Parts
Freightliner Cascadia Lane Alert Off Switch A06-90128-020
$19.99Unit price /UnavailableJJ Engine Parts
Freightliner Cascadia Modular Switch Field, Multiplex, Footwell, A06-90128-055
$15.00Unit price /UnavailableJJ Engine Parts
Allison A51 TCM for 3000RDS Transmission 29545536 ATA5105
$350.00Unit price /UnavailableJJ Engine Parts
Horton Electronic Fan Clutch 996020 986064 986064 1998178 135494 10340732
$350.00Unit price /Unavailable- Sold out
JJ Engine Parts
Horton OEM Fan Clutch for Cummins N14 NT88 Engine 991019 981003 Freightliner App
$550.00Unit price /Unavailable JJ Engine Parts
Detroit DD13 OEM Diesel Engine Control Module ECM ECU A0004467635
$800.00Unit price /UnavailableJJ Engine Parts
Cummins ISB6.7 Paccar PX6 OEM Lubricating Oil Filter Head 3970201
$90.00Unit price /Unavailable- Sold out
JJ Engine Parts
Horton Electronic Fan Clutch for Cummins QSB6.7L 9902047 9802047 982162
$550.00Unit price /Unavailable JJ Engine Parts
Cummins ISL OEM Engine Control Module ECM ECU 4921776 4921797 CM850
$750.00Unit price /Unavailable- Sold out
JJ Engine Parts
Cummins QSB4.5 OEM Engine Control Module ECM ECU 4921776 4921797 CM850
$750.00Unit price /UnavailableJJ Engine Parts
Cummins QSX15 OEM Diesel Engine Control Module 3408501 3681405
$2,000.00Unit price /Unavailable

Used Diesel Engine Parts for Trucks & Fleet Repairs
JJ Engine Parts supports fleet operators, repair shops, and independent diesel mechanics who need dependable used diesel engine parts. Whether you are sourcing Cummins or Detroit engine parts, or supporting other diesel platforms, selecting the correct component is critical.
That’s why we focus on parts that match OEM specifications and real-world applications. Our inventory is structured to help customers quickly find the right solution for rebuilds, replacements, and legacy engine repairs.
Used Engine Components Available
Our collection includes used truck engine parts for sale that are commonly required in diesel repair and maintenance. Availability changes based on inventory, but supported components often include:
- Used ECM ECU for sale (OEM and inspected used options)
- Used turbochargers for sale
- Cooling system components
- Affordable used engine parts for budget-conscious repairs
- Used OEM components for major diesel platforms, including Detroit and Cummins engine parts
Each listing is reviewed for compatibility with specific engine models whenever possible and verified prior to shipment.

Nationwide Shipping & Fitment Assistance at JJ Engine Parts
We ship used diesel engine parts across the United States, depending on part size and destination. JJ Engine Parts regularly supports major diesel platforms, including Cummins, Detroit Diesel, Caterpillar, Volvo, and PACCAR engines. Browse our selection of used engine parts, or contact our team to help you source the right component for your diesel truck.
Frequently Asked Questions About Used Engine Parts
How do I find the correct used engine part?
How do I find the correct used engine part?
Fitment depends on your engine model and serial number. Contact us for assistance before ordering.
Are used ECM or ECU units available?
Are used ECM or ECU units available?
Yes. Used ECM ECU units are available in OEM and inspected options when in stock.
Do you sell used turbochargers?
Do you sell used turbochargers?
Yes. Used turbochargers are offered based on availability.
Are used OEM engine components reliable?
Are used OEM engine components reliable?
When properly inspected and matched to the correct engine, used OEM components can provide dependable performance.
Do you ship used truck engine parts nationwide?
Do you ship used truck engine parts nationwide?
Yes, we ship used engine parts across the United States, depending on part size and destination.