Built Allison Transmissions vs OEM: What You’re Really Getting

If you’re comparing a built Allison transmission to an OEM or reman unit, you’re probably thinking about price, but what you really need to consider is downtime, reliability, and how long that transmission will hold up under load.

At Inglewood Transmission, our built Allison transmissions aren’t stock replacements, they’re fully rebuilt, upgraded, dyno-tested units designed to outlast and outperform anything you’d get from a dealership or a mass reman operation.

What “Built” Means at Inglewood

Our built transmissions start with a full teardown and inspection. Every known weak point in the Allison 1000 is addressed with premium internal upgrades, not just factory-style parts.

• Billet input and output shafts to handle tuned power and heavy towing
• Upgraded clutch packs for better holding capacity and longer life
• Valve body modifications for quicker shifts and reduced heat
• Dyno-tested before shipping to ensure reliability

These are transmissions built for real-world abuse, not minimum factory spec.

What You’re Actually Getting with OEM or Reman

• Reused or stock-grade parts, often with minimal upgrades
• No billet internals or high-performance clutch packs
• Built to pass a basic road test, not long-term use
• Not tested under full load conditions

They might work, for a while. But when you tow, tune, or drive hard, they fail fast. And when they do, you’re paying for a second rebuild, tow bills, and downtime.

Why Built Is a Better Long-Term Investment

It’s not just about performance, it’s about total cost of ownership. A built transmission avoids the domino effect of failures that plague OEM units. You install it once, and it holds.

Our customers regularly replace dealer or reman units with one of our built Allisons, not because they want to, but because they have to. The difference becomes clear the moment the stock unit gives out under load.

What About DIY Kits?

If you’re looking to build your own transmission, we do offer DIY rebuild kits with many of the same upgraded internals. These are for skilled builders with tools, workspace, and time. But if you want a ready-to-run, dyno-tested transmission with no guesswork, our built transmissions are the move.

Bottom Line

If you want real reliability, you don’t want OEM. You want a built Allison from a team that’s done it before, over and over again. From work trucks to tow rigs and everything in between, we build them to hold.

Browse our built transmissions or learn more about our shop.

FAQs

Q: What’s the difference between your built transmissions and an OEM or reman?

A: Ours are upgraded, dyno-tested, and designed to last. OEM/remans are basic replacements with reused or stock parts.

Q: Do you offer installation?

A: Yes. In-house installs are available in California with a hot flush and adaptive-learn reset. We also offer shipping both ways.

Q: What’s the warranty?

A: Most of our built transmissions come with a full warranty. Check each listing for specific coverage details.

Q: Do your DIY kits include the same parts as your built units?

A: Many do, but installation, tuning, and testing is up to you. For plug-and-play peace of mind, go with a built transmission.