What Transmission Do I Have? The Complete Guide to Identifying Your Transmission

If you’ve ever searched “what transmission do I have?”—you’re not alone. This is one of the most common questions we hear at Monster Transmission. Whether you’re dealing with slipping gears, torque converter shudder, or planning an upgrade, knowing exactly which transmission is in your vehicle is the first and most important step.

The challenge? Many vehicles—especially trucks—used multiple transmissions in the same model year. A Ram 3500 might have a 68RFE or an Aisin. A Silverado might have a 4L60E, 6L80, or 10L80 depending on engine and year.

This guide breaks it down clearly—and shows how our Monster Transmission Finder Quiz removes all the guesswork.

Why Transmission Identification Matters

  • Ordering the wrong transmission can cost thousands
  • Torque converters are transmission-specific
  • Electronics (TEHCMs, solenoids) vary by year
  • Warranty coverage depends on correct application

We routinely see customers told “you have a 6L80” when the vehicle actually requires a 6L90 or different variant. That’s why Monster verifies every build by vehicle data—not assumptions.

Method 1: Identify by Vehicle, Engine & Year

This is the most common starting point and works well for popular platforms:

GM / Chevrolet / GMC

  • 1999–2006 Silverado 1500 → 4L60E
  • 2007–2013 Silverado 1500 → 4L60E or 6L80E
  • 2014–2018 Silverado 1500 → 6L80E
  • 2019–Present Silverado 1500 → 8L90 or 10L80

Dodge / Ram

  • 1500 (5.7L) → 545RFE / 65RFE / 8HP70
  • 2500 (6.7L) → 68RFE
  • 3500 (6.7L) → 68RFE or Aisin AS69RC

Ford

  • 2009–2017 F-150 → 6R80
  • 2018–Present F-150 → 10R80
  • Super Duty (Diesel) → 6R140 / 10R140

⚠️ This method is a guide—not a guarantee. Drivetrain, build date, and production splits matter.

Method 2: VIN Decoding (Most Accurate)

Your VIN contains engine, drivetrain, and production data. Dealers and OEM scan tools use this—but most consumers don’t have access.

This is exactly why Monster built the Transmission Finder Quiz.

Instead of decoding VINs manually, our quiz asks the same questions our internal fitment team uses—then matches your vehicle to the correct transmission build.

👉 Find Your Transmission in Under 60 Seconds

Method 3: RPO Codes (GM Vehicles)

GM vehicles include an RPO sticker—usually in the glove box.

  • MYC → 6L80E
  • MYD → 6L90E
  • M30 → 4L60E

This works well for GM, but doesn’t help with Dodge or Ford platforms.

Why the Monster Transmission Finder Quiz Is Different

Our quiz isn’t a generic selector—it’s tied directly to Monster’s fitment database.

  • Verifies engine, drivetrain, and production year
  • Accounts for known split years (like Ram 3500)
  • Shows the correct Monster tier (RoadReady, Street, Sport)
  • Eliminates wrong-part orders

This is the same process our sales specialists use—automated for you.

👉 Take the Monster Transmission Quiz

FAQ

Can two identical trucks have different transmissions?
Yes—especially in Ram 2500/3500 and GM half-tons.

Does engine size matter?
Absolutely. A 5.3L Silverado and a 6.2L Silverado may not share the same transmission.

What if my transmission was swapped before?
That’s exactly when the quiz and Monster support team matter most.

Bottom Line

If you’re guessing—you’re risking thousands. The easiest, fastest, and safest way to identify your transmission is with Monster’s Transmission Finder.

We build more than transmissions—we build confidence.

👉 Find the Right Monster Transmission Now