FAQs
What’s the difference between the Ready Run Precision Plus and Heavy Hauler Cummins engine packages? ▾
Precision Plus is an OEM+ ready run replacement designed for a clean install path and daily-driven reliability. Heavy Hauler is a towing-focused ready run engine package built for sustained load, heat, and hard duty cycles.
Which Ready Run package is best for towing a Ram 2500/3500? ▾
If your main goal is towing and working the truck under load, Heavy Hauler is typically the best match. It’s built around towing priorities like durability, heat management, and response in real-world duty cycles.
How do I choose the correct Cummins year range (5.9 vs 6.7) for my engine replacement? ▾
Start by matching your truck’s engine family (5.9L or 6.7L) and the correct model year range. Use the dropdown to route to the right product page, then confirm all fitment details and included components before checkout.
What’s the difference between pickup and cab & chassis Ready Run engine packages? ▾
Cab & chassis trucks can have different accessory layouts, emissions equipment, or calibration requirements compared to pickups. If you have a cab & chassis, choose the cab & chassis option to avoid fitment issues and installation surprises.
Are these “drop-in” Cummins engines, or do I need to transfer parts from my old engine? ▾
Ready run packages are built to simplify replacement, but what’s included can vary by year range. Always review the product page to confirm what comes with the package (fuel system, turbo components, sensors, accessories) and what you’ll transfer.
Do I need tuning or programming after installing a Ready Run Cummins engine package? ▾
Some trucks may require ECM relearns, emissions-related checks, or calibration verification depending on year range and configuration. If your setup includes performance components or prior tuning, confirm compatibility and consult the product page guidance.
What break-in steps should I follow for a reman Ready Run Cummins engine? ▾
Follow D&J’s break-in recommendations: proper prime, controlled heat cycles, and early oil/filter changes. Break-in is critical for ring seal, bearing life, and long-term reliability—especially on towing trucks.
What should I inspect when my Ready Run engine is delivered? ▾
Inspect the crate for damage before signing, take photos of any dents/tears, and confirm the part number matches your order. Report freight damage immediately so the shipment and claim process is clean and documented.
*Fitment and outcomes vary by truck configuration, engine condition, supporting components, tuning, and duty cycle.
