A41X 4L60E Automatic 4-Speed Kit for 1967-1972 K-Series
BASIC A41X 4L60E CONVERSION KIT FOR K-SERIES TRUCK, K-5 BLAZER, JIMMY, SUBURBAN, AND CARRYALL
Part # requestaquote
A41X 4L60E 4-Speed Automatic GM K-Series is the ultimate upgrade for classic GM K-Series trucks and 4WD SUVs. This builder's kit provides modern overdrive technology while retaining the rugged reliability your truck needs. Cutting and/or fabrication will be required for installation, making it perfect for enthusiasts who want a performance-focused, customizable automatic upgrade.
Gear Ratios: 3.06, 1.63, 1.00, 0.70
Available in Three Performance Stages:
- Stage 1: 450 lb-ft torque
- Stage 2: 550 lb-ft torque
- Stage 3: 650 lb-ft torque
Key Features:
- Low RPM cruising for highway efficiency
- Dyno-tested for superior shift quality and reliability
- Electronic controller with programmable shift strategy
- Lockup torque converter with optional stall speeds
- No tunnel cutting required for most applications
The A41X 4L60E is an excellent replacement for older automatic transmissions such as the 904, 727, 518, Powerglide, TH350, TH400, 200R4, or 700R4. Modern technology delivers better acceleration, reduced cruising RPM by up to 30%, and smoother highway performance.
Complete 4-Speed Conversion Kit Includes:
- Automatic Transmission – A41 (GM 4L60E / GM 4L65E aftermarket replacement)
- Bellhousing
- Lockup Torque Converter
- Rubber Cooling Line
- Hardware
- Isolator Mount
- COMPUSHIFT Sport Controller – full smartphone integration and custom programming
- Bellhousing Dust Cover
- A41 to GM NP205 Adapter
- Dipstick and Tube – OEM style
- Auxiliary Oil Cooler – High performance for Stage 2 & 3, optional for Stage 1
- Detailed Instructions
COMPUSHIFT Sport Highlights:
- Plug-and-play installation with all OEM connectors included
- Smartphone integration via Android, iOS, PC, or Mac
- Fully customizable shift strategy and two selectable driving modes
- Adjustable shift speed, shift feel, and torque converter clutch control
- Transfer case switch input for low-range / 4WD speedometer calibration
- Durable, IP65-rated for water and dust resistance
Upgrade your classic GM K-Series truck or 4WD SUV with the A41X 4L60E 4-Speed Automatic Conversion Kit—experience modern overdrive performance, programmable control, and robust reliability for off-road adventures and highway cruising alike.
| Item# | Status | Description | Your Price | |
|---|---|---|---|---|
| requestaquote | In Stock |
Silver Sport Transmissions A41X 4L60E 4-Speed Automatic is a modern performance upgrade for your classic GM K-Series truck or SUV. Built on the proven GM 4L60E platform, this 4-speed automatic conversion kit is available in three torque stages—450, 550, and 650 lb-ft—making it perfect for K5 Blazer, Jimmy, Suburban, and Carryall owners who demand both power and reliability.
Designed to replace older automatics like the 904, 727, TH350, TH400, 200R4, or 700R4, the A41X 4L60E provides better acceleration, smoother shifts, and a 30% reduction in cruising RPM thanks to its overdrive design. Whether you’re tackling off-road trails or cruising the highway, this automatic overdrive kit delivers low RPM efficiency, precise electronic control, and long-lasting durability.
With the included COMPUSHIFT Sport controller, you can fully customize your shifting strategy and switch between two driving modes with ease. Enjoy plug-and-play installation, smartphone integration, adjustable shift speeds, and torque converter control for a personalized driving experience. The kit comes complete with bellhousing, lockup torque converter, isolator mount, cooling lines, auxiliary oil cooler (optional for Stage 1), dipstick and tube, NP205 adapter, and detailed instructions.
Upgrade your 4WD GM K-Series with the A41X 4L60E 4-Speed Automatic Conversion Kit—modern technology, overdrive efficiency, and unmatched control for classic trucks and SUVs.
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