LS swaps are everywhere for good reason — the GM LS family makes big, reliable power and drops into almost anything. But the engine is only half the driveline. Picking the best transmission for an LS swap is what makes the whole thing drive right and live under load. Here is how to choose.
The Popular LS-Swap Automatics
- 4L60E — the most common and affordable choice; great for mild to moderate LS builds.
- 4L70E — a stronger evolution of the 4L60E family for a bit more capability.
- 4L80E — the heavy-duty pick for high power and towing; bigger and stronger.
- 6L80E — a modern six-speed for better gearing, drivability, and highway manners.
How to Choose
Match the transmission to your power and use. A street LS making moderate power is happy behind a well-built 4L60E or 4L70E. Push serious horsepower or add weight and towing, and the 4L80E or a six-speed 6L80E is the smarter, stronger choice. The key with any LS swap is that the transmission is built for the power, not just bolted in stock.
LS-Swap Builds from Mad Dog
For most LS swaps, the Punisher 4L60E or Godfather 4L70E are excellent starting points. For high-power or heavy builds, step up to the Destroyer 4L80E or the six-speed Godfather 6L80E. Every unit is pre-programmed to your VIN so it works with your swap, not against it. Tell us your combo and we will match the right build.
Order Your Transmission from Mad Dog
Every Mad Dog transmission is built to order, dyno-tested, and pre-programmed to your VIN so it drops in and drives right. You get free U.S. shipping, no core charge, and a build backed by decades of GM transmission experience. Shop all transmissions, compare the Punisher, Godfather, Dominator, and Destroyer builds, or call us at (770) 781-0949 for a custom quote.