Heavy Duty Truck Engine Conversion Tool – Year, Make, Model Compatibility
Starting an engine conversion without knowing exactly which electronic interfaces, motor mounts, brackets, piping kits, and upfit components fit your specific chassis is one of the fastest ways to stall a project, blow the budget, and end up with incompatible parts on the shop floor.
Most truck owners begin by discussing the project with their local shop. In reality, even experienced shops see only a fraction of the conversions we support monthly. Shops earn revenue primarily through billing labor hours, which often means more fabrication and custom work. Our tool was built to change that outcome.
Our Heavy-Duty Truck Engine Conversion Tool removes the guesswork. Simply select your truck's year, make, and model, and the tool instantly returns every Kustom Truck Parts component engineered for that exact application — the same dataset our internal sales team uses daily to support countless engine conversions every month.
We offer our engine conversion components as individual SKUs rather than a single pre-packaged kit. Every project has a different starting point. Some customers already have compatible components from a previous build or donor engine. Our tool clearly shows exactly what we offer for your specific year, make, and model. This lets you quickly evaluate what you already have, what you truly need, and which upgrades make sense — so you can purchase only the parts required to complete your conversion and get your truck back on the road.
With more than 30 years of specialized experience in heavy-duty truck engine conversions, we've engineered and manufactured the industry's most comprehensive catalog — nearly 1,000 unique SKUs spanning electronic harnesses, brackets, piping kits, and engine upfit components. This depth of knowledge and proven fitment data is what sets our approach apart and gives you the clearest possible roadmap for a successful swap.
After you select your truck's year, make, and model, the tool instantly displays every compatible Kustom Truck Parts component for your specific application.
- Engine-to-cab wiring harnesses matched to your engine and chassis electronics
- CAC and radiator piping kits sized for your truck's cooling package and new engine
- Air intake adapters to connect your existing air cleaner to the new engine's turbo
- Engine mounting brackets and isolators that match your specific chassis
- Engine upfit parts to configure the new engine for the chassis it is being installed into
Every result includes application notes and fitment details so you can confirm compatibility before you order.
How the Engine Conversion Tool Works
Our engine conversion tool is built on the same deep compatibility database our sales team uses daily — refined across thousands of heavy-duty swap projects over more than 30 years.
Here's exactly how it works:
1. Enter Your Truck Details
Select your truck's Year, Make, and Model, plus the Starting Engine (what you're removing) and the Replacement Engine (what you're installing). These five inputs allow the tool to cross-reference your exact chassis against our full catalog.
2. Instant Results
The tool immediately displays every Kustom Truck Parts component validated for your specific application — from engine-to-cab wiring harnesses and mounting brackets to piping kits and upfit components.
3. Refine the Results With Smart Filters
- Fitment Specific - Shows only parts engineered precisely for your year/make/model and engine combination (hides universal items).
- Conversion Parts - Narrows the list to the core interface components typically needed for your swap.
You can toggle between views at any time. Unselect Conversion Parts and choose individual subcategories to see all the products KTP offers — including optional upgrades and performance parts — so you only see exactly what's relevant to your project.
The tool automatically accounts for all the critical variables: chassis electronics generation, cab architecture, mounting points, cooling package, and transmission compatibility. A Cummins-to-CAT swap in a Peterbilt 389 needs a completely different set of parts than the same swap in a Kenworth W900 or Western Star 4900 — and the tool handles those differences for you.
This means no more guessing, no more sorting through irrelevant parts, and no more back-and-forth calls just to find out what actually fits.
What You Can Verify with the Truck Engine Fitment Tool
A successful engine conversion comes down to the details. Our tool helps you verify the critical compatibility points before you order, so you can avoid the most common causes of delays, extra fabrication, and costly returns.
Here's what the tool confirms for your specific year, make, model, starting engine, and replacement engine:
- Electronic Interface: The tool matches your target engine's ECM generation (ADEM, DDEC and CM) with your chassis electronics (Pre-NAMUX, NAMUX 1, NAMUX 2, etc.) to identify the correct engine-to-cab wiring harnesses. It also determines the compatible power distribution harnesses, throttle pedal/TPS kits, and Smart Gauge integration options.
- Cooling & Air Handling: Heavy-duty truck OEMs updated cooling packages multiple times (1994, 2004, and 2008) to meet evolving emissions and engine demands. These changes altered inlet/outlet positions, radiator sizes, and overall layouts, meaning pipes from a donor engine are rarely a direct fit. The tool accounts for your specific chassis cooling package and new engine to show correctly routed charge air cooler (CAC) piping, radiator hoses, air intake adapters (matched to the turbo inlet diameter), and exhaust routing components.
- Mounting & Brackets: The tool automatically verifies the correct engine positioning for your specific chassis and engine combination. It displays the correct front and rear motor mounts, hardware and bushing kits so the new engine sits exactly where it needs to in your truck.
- Engine Upfit & Integration: The tool also shows the components needed to properly configure the donor engine for your specific chassis. This includes serpentine belt upgrades, fan hubs, belts and blades, A/C compressors, suction and discharge lines, and other integration hardware required to fully adapt the new engine into your truck.
This gives you a complete, accurate picture of what's available and what will actually work — helping you plan smarter and move forward with confidence.
Why Use Our Engine Conversion Tool
Most engine conversion advice comes from word-of-mouth — “truck stop talk” — where someone's friend did a swap using a local shop and passed along what they used. While that can be a starting point, it rarely accounts for all the critical variables in your specific truck.
Our Heavy Duty Truck Engine Conversion Tool was built to eliminate guesswork and inconsistency. It draws from the same deep, validated compatibility database our entire sales team relies on daily — refined over 30+ years and thousands of real engine swaps.
Here's why the tool is the smarter choice:
- Total consistency — The parts recommended today will be exactly the same next month, no matter which KTP team member you speak with.
- Accuracy you can trust — Every result is based on your exact Year, Make, Model, Starting Engine, and Replacement Engine.
- Complete picture — You see every interface component we offer for your application, not just what one person remembers in the moment.
- Live and always up to date — As we develop new parts or improved designs, they appear in the tool immediately.
- No missed pieces — The tool helps ensure nothing critical is overlooked when quoting or planning your conversion.
Whether you use the tool yourself or call in to our sales team, you get the same accurate, experience-backed recommendations that fit your application every single time.
For a high-level overview before using the tool, our engine conversion basics guide walks through the four core systems every swap has to address.
Who the Tool Is Built For
Our Heavy-Duty Truck Engine Conversion Tool is designed to deliver the same accurate, consistent results whether you're a professional builder or an owner-operator planning your first swap.
Here's how different users benefit:
Professional Shops & Mechanics
Quickly build precise parts lists and quotes using the same validated data our internal team relies on. This reduces back-and-forth with customers and helps avoid mid-project surprises or costly rework.
Fleet Managers
Standardize engine conversion specifications across multiple trucks for consistent results, predictable costs, and smoother project planning.
Owner-Operators & DIY Builders
Get a clear 30,000-foot view of every interface component available for your specific truck and engine combination. This helps you evaluate what you already have, decide what you truly need, and avoid the common mid-swap scramble for missing parts.
Performance & Custom Builders
Start with the exact conversion components required, then easily layer on premium chrome and polished upgrades, stainless braided hose kits, valve cover badges, peanut covers, and other customized parts for show-quality builds that go well beyond a standard work truck.
No matter your role, the tool gives you the same reliable recommendations our sales team uses every day — ensuring consistency, minimizing guesswork, and helping you complete a clean, successful engine conversion.
Ready to Build Your Parts List?
Enter your year, make, and model above, and the tool will return every KTP component validated for your conversion. If you want a second set of eyes on your configuration before ordering, contact our team with your VIN and planned engine and transmission combination. We'll review your swap plan, flag anything the tool may not have captured, and make sure you have everything you need before the project starts.
Enter your truck's Year, Make, Model, Starting Engine, and Replacement Engine above. The tool will instantly show every Kustom Truck Parts component validated for your exact application — including both the essential conversion parts and optional upgrades.
Use the filters to focus on Conversion Parts only, or explore individual subcategories to see everything available. You'll get a clear, accurate roadmap based on the same data our sales team uses daily.
Need help or a second set of eyes? Contact our team with your VIN and planned swap details. We'll review your configuration, flag anything unique to your build, and help you put together a complete, cost-effective parts list.
Start your conversion with confidence — the right parts, the first time.
FAQs
What makes a truck engine swap compatibility tool more accurate than a chart?
A static chart only shows general engine pairings. Our tool delivers far greater accuracy because it draws from the same live compatibility database our sales team uses daily.
It factors in your exact Year, Make, Model, Starting Engine, and Replacement Engine — along with critical variables like chassis electronics (Pre-NAMUX, NAMUX 1/2, etc.), cooling package revisions, mounting positions, and transmission options. Every result is tied to real SKUs with detailed fitment notes, so you see precisely which harnesses, motor mounts, piping kits, and integration components are engineered for your truck.
The result is consistent, trustworthy recommendations that minimize mistakes and eliminate reliance on word of mouth or generalized information.
Do I need to know my engine's ECM generation before using the tool?
Yes — you will need to know the ECM generation of your replacement engine (for example: CM570, ADEM III, DDEC IV, etc.).
After you select your replacement engine in the tool, it automatically filters results to match that engine's electronics platform, displaying the precise engine-to-cab wiring harnesses, throttle pedal kits, brackets, piping kits, and engine upfit components compatible with both your chassis and your new engine.
If you're unsure of the exact ECM generation on your donor engine, KTP can help identify it using the engine's serial number. This ensures you get the most accurate results possible.
Does the tool only show parts I absolutely need for the engine conversion?
No. The tool shows every Kustom Truck Parts component that fits your specific Year, Make, Model, Starting Engine, and Replacement Engine — including both essential conversion parts and optional upgrades.
Use the Conversion Parts filter to narrow the results down to the core interface components we offer for your swap. You can also switch to individual subcategories to explore upgrades and additional options (such as chrome/polished accessories, stainless braided hoses, performance air intake kits, or other enhancements) without seeing unrelated universal products.
This flexible system gives you full visibility and control — so you can quickly see what you already have, what you truly need, and which upgrades make sense for your project and budget.
What if I can't find my exact truck in the tool?
We currently support Peterbilt, Kenworth, Freightliner, Western Star, and Sterling trucks.
If your specific year, make, or model isn't listed yet, it simply means we haven't loaded that combination into the fitment tool or haven't created the part numbers yet. We're continually adding new models and expanding coverage.
If your truck is one of the supported brands, give our team a call. We can quickly pull the right parts from our full catalog and help with your specific project.
How often is the fitment tool updated?
The fitment tool pulls from our live product catalog and compatibility database. New parts, improved designs, and additional truck models are added weekly as soon as they are developed and fitment-validated.
You're always seeing the most current options available — the same information our sales team uses when quoting customers every day.
Is it better to call your sales team or use the tool myself?
Both options give you the same high-quality results because our sales team uses this exact same tool every day.
Using the tool yourself gives you instant, 24/7 access and full visibility so you can explore options, see what you already have, and build your own parts list on your schedule. Calling our sales team is ideal when you want expert guidance, have a complex or unusual application, need help interpreting results, or prefer someone to build the quote for you.
Many customers do both: they run the tool first to get familiar with the options, then call us for confirmation or to place the order. There’s no “better” way — the tool ensures consistency either way.