Remanufactured Heavy-Duty Powertrains
Complete Remanufactured Engines & Transmissions — Ready to Install
Cummins, Detroit, and Eaton Fuller, remanufactured to spec by master builders, documented every step, and warrantied. Sold complete and drop-in ready — with no core to send back. Built for the construction, aggregate, and vocational crews who can't afford downtime, and shipped nationwide from Houston.
What We Build
Remanufactured Diesel Engines
Cummins ISX & X15, Detroit Series 60, Caterpillar C15 — torn all the way down and built back to spec.
View engines →Rebuilt Eaton Fuller Transmissions
13- and 18-speed heavy-duty transmissions, rebuilt and tested to spec.
View transmissions →No Core. No Hassle.
Most rebuild shops make you tear out your old unit, ship it back, and chase a refund deposit. We don't — every Ironstar unit is sold complete and outright, so you buy it, it's yours, with nothing to send back.
And because we only ship units that are already built, tested, and documented, there's no waiting on a rebuild and no tech time on your end. Spec it, we ship it, drop it in — and get your crew back to work.
Built by Master Hands, Documented Every Step
Ironstar is built on a trade handed down for generations. Our master builders learned the craft from previous generations and carry factory certification across the Cummins lineup — ISX, ISM, ISL, ISC, and the ISX CM871 — plus the Detroit Diesel Series 60. Heavy-duty diesel is all we do. It’s old-school American craftsmanship: hard-won skill, honest hours, and a standard that never leaves the bench unproven.
Forged the way Texas forges everything — tough as pig iron, built by hand, with the proof in the crate.
Inspect
Cores serial-verified before any work.
Measure & Machine
Objective specs, precision machining.
Build to Spec
High-quality components, built to exacting spec.
Inspected & Signed
Fully checked before it ships — master builder’s sign-off, a serialized build manifest, and a full photo record.
What you get
The build manifest ships in the crate
- Serialized build record — tied to your unit’s own serial number.
- Photo QC packet — teardown, measurements, machining, and assembly.
- Master builder’s sign-off — inspected, signed, and stamped before it ships.
Like a passport for your powertrain — every unit travels with the papers that prove how it was built.
Every engine and transmission is backed by a 12-month / 100,000-mile limited warranty. See full terms →
Get Your Truck Back to Work
Down truck or a planned swap — we ship a complete, ready-to-run unit with no core to send back. Tell us your platform and we'll send pricing and lead time.
Request a QuoteRequest a Quote
Tell us what you're running. We'll get back with pricing and availability.
Houston, Texas — shipping nationwide.