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Now Buying Diesel Cores

We buy good diesel engine & transmission cores — outright, for cash.

Got a diesel engine or transmission that isn't cracked? We'll buy it — running or not. Ironstar buys Cummins, Detroit, CAT, and Eaton Fuller cores from scrap yards, salvage lots, shops, and fleets. If it's not cracked, we want it — fast cash, no rebuilding on your end.

Outright purchase — no core exchange required
Fast, fair offers
Houston, TX based
What We're Buying

The cores we want

Heavy-duty diesel engines and transmissions — the same platforms we build. Don't see yours listed? Reach out anyway; if it's a clean core, we'll take a look.

Most Wanted

Transmissions

Eaton Fuller Roadranger manual transmissions — our steadiest, fastest-moving core.

  • Eaton Fuller9-, 10-, 13- & 18-speed Roadranger manuals
  • RTLO seriesRTLO-16913A · 18913A · 18918B · 20918B and similar RT / RTLO models
Buying Now

Engines

On-highway heavy-duty diesel cores. Pre-emissions CAT and Series 60 are especially prized — grab us a clean one.

  • CumminsISX / X15 (top priority) · ISM · ISL · ISC
  • Detroit DieselDD15 · Series 60 (12.7L & 14.0L)
  • CaterpillarC15 (and clean pre-2010 on-highway Cat cores)
Know Before You Reach Out

What makes a good core — and what we pass on

Use this as a quick checklist before you reach out. Not sure? Send photos of the unit and the serial/data plate and we'll tell you straight.

We want cores that…

A "good" rebuildable core, plain and simple.

  • Have a non-cracked block, head, and crankshaft
  • Turn over freely or run — little to no blowby
  • Show healthy oil pressure when run
  • Have bearings in inspectable condition
  • Carry a legible, matching serial & data plate (ESN/CPL on engines; casting/serial on transmissions)
  • Are complete — all major components still on the unit

We pass on cores that…

These knock a core out — no need to send these in.

  • Have a cracked block, head, or crankshaft
  • Are locked up / won't turn over
  • Show heavy blowby or excessive smoke
  • Have low or no oil pressure
  • Are missing or have an unreadable serial/data plate
  • Are heavily parted-out — major components stripped
  • Have fire, flood, or catastrophic internal damage
Simple & Fast

How selling us a core works

No runaround. Three steps from your yard to cash in hand.

1

Send the details

Give us the make, model, and what you know about it — plus photos of the unit and the serial/data plate. Use the form below or send us an email.

2

Get a fair offer

We review what you sent and come back with a straight, fair cash offer based on the platform and condition.

3

Get paid

We agree on a price, arrange pickup or freight, and pay you. Outright purchase — you keep it simple, we handle the rest.

Talk To Us

Got a core? Let's make a deal.

The fastest way to make a deal is to email us or fill out the form — send a few photos of the unit and the serial/data plate, and we'll get right back to you with an offer.

Submit your core

Fill this out and we'll get back to you with an offer. Attach photos when you send the email that opens.

This opens a pre-filled email to Ironstar Rebuilders — just attach your photos and send.