SST A41 4L60E Automatic 4-Speed Conversion Kit for MOPAR Street Rod & Truck

Bring modern efficiency and smart, electronic control to your classic MOPAR build. The SST A41 4L60E Automatic 4-Speed Conversion Kit by Silver Sport Transmissions is the ultimate technological upgrade for vintage street rods and classic MOPAR trucks. Offering an impressive 30% reduction in cruising RPM, this system completely transforms your highway driving experience while maximizing acceleration off the line.

This is our Basic Builder's Kit, providing the core powertrain foundation for customizers. Because this kit places a high-performance overdrive transmission into classic chassis configurations, some floorpan cutting and structural fabrication may be required for installation.

High-Performance Overdrive & Custom Tuning

The SST A41 architecture adapts rugged, time-tested GM 4L60E/4L65E internal designs into a universal powerhouse capable of replacing tired, outdated transmissions like the MOPAR 904, 727, and 518, or classic Powerglide, TH350, TH400, 200R4, and 700R4 units.

• Three Torque Stages Available: Stage 1 (450 lb-ft), Stage 2 (550 lb-ft), or Stage 3 (650 lb-ft) configurations to perfectly match your engine output.
• Next-Gen App Control: Program your shifting strategy seamlessly. The included COMPUSHIFT Sport controller uses built-in Bluetooth to connect directly to your iOS or Android smartphone, tablet, or computer. Fully adjust your shift speeds, shift feel, and torque converter clutch lockup on the fly.
• Dual Calibration Modes: Switch between gas-saving economy mode and aggressive performance mode with a physical button or via the app.
• Street Comfort: Enjoy low-RPM highway cruising, exceptional shift quality, and reduced cabin noise. Every unit is fully dyno-tested before leaving our facility to guarantee performance out of the box.

A41 4L60E Gear Ratios

Optimized gearing delivers aggressive launches with deep overdrive cruising:

Basic Builder's Kit Components

Our basic package supplies the necessary electrical, fluid mechanical, and structural conversion hardware for your swap:

• A41 Automatic Transmission: Precision-built 4-speed overdrive automatic (GM 4L60E aftermarket replacement platform).
• COMPUSHIFT Sport Transmission Controller: Waterproof (IP65 rated), dustproof standalone computer featuring dual CAN-bus networks and error troubleshooting codes.
• Plug & Play Wiring Loom: Full harness fitted with OEM connectors to eliminate wire splicing.
• Lockup Torque Converter: Electronically controlled with optional stall speeds tailored to your engine cam and power band.
• 3-Wire Throttle Position Sensor (TPS): Simple bolt-on module that communicates throttle load to the computer.
• Installation Essentials: Application-specific bellhousing, SFI-approved flex plate, mechanical speedometer cable, OEM-style dipstick/tube, inspection cover, slip yoke, rubber cooler lines, and high-strength Grade 8 mounting fasteners.
• Wiring Safeguards: Integrated reverse light wiring.
• Stage 2 & 3 Exclusive: Includes a high-performance auxiliary transmission oil cooler (optional purchase add-on for Stage 1 builds).
• Support: Detailed installation manuals and free lifetime technical support.

Note: Driveshafts are no longer bundled automatically but are available for purchase separately.

Get a Custom Quote for Your MOPAR Build

Let our technical experts configure the right torque stage, torque converter stall speed, and cooler requirements for your MOPAR street rod or classic truck project.

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