Description
Product Overview
The Gearstar NAG1 transmission is a high-performance, custom-built Mopar 5-speed automatic designed for serious horsepower and reliability. It is built for 2005–present Dodge Charger, Magnum, 300C, and Challenger models equipped with 5.7L or 6.1L HEMI engines.
This NAG1 transmission upgrade is ideal for both street and performance applications, delivering strong shift quality, durability, and consistent performance under high power conditions.
A standalone transmission controller is required for non-factory installations.
Performance Specifications
- Horsepower Rating: Up to 1000 HP at the crankshaft
- Gears: 5 forward gears with improved step-ups
- Torque Converter: Includes custom Yank Performance Torque Converter
- Warranty: 3-year, 50,000-mile warranty
Key Features
- 5 forward gears for smooth and efficient power delivery
- Electronically controlled shifting with hydraulic operation
- Torque converter lock-up clutch for improved efficiency
- WA580 / W5A580 transmission family designation
- Designed for high-performance street and strip use
- Built for durability under high-horsepower applications
Applications
This NAG1 transmission is designed to fit:
- Dodge Charger (2005–Present)
- Dodge Magnum
- Chrysler 300C
- Dodge Challenger
- 5.7L and 6.1L HEMI engines
It is also commonly used in select Chrysler, Jeep, Dodge, and Ram applications, depending on configuration.
Key Benefits
- Stronger and more reliable than stock transmissions
- Improved shift control and faster shifting response
- Better fuel efficiency under normal driving conditions
- Increased transmission life under performance use
- Reduced maintenance needs with upgraded internal components
Why Upgrade to Gearstar NAG1 Transmission
- Custom-built by one technician for maximum attention
- Telephone support by experienced transmission professionals
- Installation guides included
- Voted Best Tech Support by Street Rodder Magazine (17 years in a row)
- Highest quality parts – only used in Gearstar's own vehicles
Build Quality
Every Gearstar NAG1 transmission is custom-built by a single technician for maximum attention to detail and consistency. Each unit is assembled using high-quality performance components and tested for durability and performance before shipment.
Gearstar uses only trusted parts and proven upgrade components to ensure long-lasting reliability under demanding conditions.
Upgrade with confidence! Gearstar builds custom NAG1 transmission options based on your exact specifications.
