Replacement engine or rebuild?
Ask for the scope that suits the job: a replacement assembly or a rebuild of your existing engine. Availability, machining, included parts and timing are confirmed for your exact engine.
Work trucks · Diesel power
Diesel Replacement Engines & Rebuilds
The truck has a job to do. Start with the diesel engine you have, then compare a replacement assembly with rebuilding your engine. Big 3 helps you put the engine, supporting work and delivery into one clear quote.
East Texas shop · Nationwide freight by quote · Visits by appointment
Choose your starting point
Which diesel is in your truck?
Ram Cummins
Request a Ram Cummins diesel replacement or rebuild quote. Send the VIN, engine serial number, dataplate and assembly requirements to Big 3.
Explore this applicationFord Power Stroke
Plan a Ford Power Stroke replacement or rebuild with Big 3. Identify your 7.3, 6.0, 6.4 or 6.7 diesel and confirm the assembly, core and installation scope.
Explore this applicationChevrolet & GMC Duramax
Compare selected Duramax catalog engines and request an application-specific replacement or rebuild quote for your Chevrolet or GMC diesel.
Explore this applicationA complete repair plan
Tell us what happened to the original engine. Have your installer identify the fuel, turbo, cooling and lubrication components that need inspection or replacement, and include them in the quote.
A useful quote starts here
Tell us what you have and what happened.
Vehicle year, make, model, VIN and engine identification.
Current diagnosis, engine condition and any previous modifications.
Engine-only or installation, delivery ZIP code and the date you need the truck working.
Compare the whole job.
Assembly & scope
Confirm whether the offer is a long block, another assembly level or a rebuild of your engine. Accessories, injectors, turbo equipment, controls and installation are included only when stated.
Core & freight
Confirm whether exchange is required and whether a deposit is included or separate. A core must match the purchased engine and be rebuildable to receive credit. Freight and unloading arrangements are confirmed for the order.
Read core requirements →Schedule & warranty
Agree on the build or supply schedule and the written coverage for your exact order. Inspection, parts availability and confirmed scope affect timing. Review the oil, maintenance and warranty requirements before use.
Review warranty information →Questions before you commit
Can I order from the model name alone?
No. Send the VIN and engine identifiers. Model year and displacement alone do not confirm the exact replacement.
Is every engine shown ready to ship?
No. A guide describes an inquiry path. Current stock, build acceptance, price and lead time are confirmed for your specific order before payment.
Can I get installation help?
Ask about installation at our East Texas shop. The engine, installation labor, supporting repairs and vehicle transport must be itemized for your job. Schedule before bringing a vehicle.
What if there is no matching catalog product?
Call or send your application details. Product-name searches can miss a supplier or engine-code listing. We confirm the available assembly or rebuild path rather than substituting a similar-looking product.
Put the next step in motion
Let’s scope your engine.
Have your identifiers and diagnosis ready. We’ll work through the assembly, core, freight and the next step with you.