A41X 4L60E Conversion Kits For 1973-1987 K-Series
A41X 4L60E 4-SPEED AUTOMATIC KIT FOR 1973–1987 K-SERIES TRUCKS & SUVS
Part # REQUESTAQUOTE
This is the basic builder's kit, cutting and/or fabrication will be required for installation.
A41X 4L60E 4-Speed Automatic Conversion Kit for 1973-1987 GM K-Series Trucks is the ultimate solution for upgrading your classic Chevy or GMC 4WD pickup or SUV. This builder's kit provides modern overdrive performance with enhanced reliability and durability. Please note: cutting and/or fabrication will be required for installation, making it perfect for hands-on enthusiasts.
Gear Ratios: 3.06, 1.63, 1.00, 0.70
Available in Three Performance Stages:
- Stage 1: 450 lb-ft torque – ideal for light-duty and street use
- Stage 2: 550 lb-ft torque – balanced performance for street and off-road
- Stage 3: 650 lb-ft torque – maximum strength for heavy-duty towing or extreme off-road applications
Key Features:
- Low RPM cruising for efficient highway performance
- Great shift quality, dyno-tested for reliability
- Electronic transmission controller with programmable shift strategy
- Lockup torque converter with optional stall speeds
- No tunnel cutting required for most K-Series applications
The A41X 4L60E is a superior replacement for aging automatic transmissions such as the 904, 727, 518, Powerglide, TH350 (Turbo 350), TH400 (Turbo 400), 200R4 (200-4R), or 700R4. Modern technology delivers smoother acceleration, improved fuel efficiency, and up to 30% reduction in cruising RPM.
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 programmable shift modes
- Bellhousing Dust Cover
- A41 to GM NP205 Adapter
- Dipstick and Tube – OEM style
- Auxiliary Oil Cooler – high performance for Stages 2 & 3, optional for Stage 1
- Detailed Instructions
COMPUSHIFT Sport Highlights:
- Plug-and-play installation with all OEM connectors included
- Smartphone integration for Android, iOS, PC, and Mac
- Fully customizable shift strategy with 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 water and dust resistance
Upgrade your 1973-1987 GM K-Series truck or SUV with the A41X 4L60E 4-Speed Automatic Conversion Kit—experience modern overdrive performance, programmable control, and reliable off-road capability while improving highway efficiency and cruising comfort.
| Item# | Status | Description | Your Price | |
|---|---|---|---|---|
| REQUESTAQUOTE | In Stock |
Product Details – A41X 4L60E 4-Speed Automatic Conversion Kit for 1973–1987 GM K-Series
Upgrade your classic GM K-Series truck or SUV with the A41X 4L60E 4-Speed Automatic Conversion Kit, designed specifically for 1973–1987 Chevy and GMC models, including the K5 Blazer, Suburban, and Carryall. This modern overdrive transmission replacement delivers superior performance, increased reliability, and smoother operation over original 3-speed and 4-speed automatics.
Key Performance Features:
- Four forward gears with ratios 3.06, 1.63, 1.00, and 0.70 for improved highway efficiency
- Three performance stages: Stage 1 – 450 lb-ft, Stage 2 – 550 lb-ft, Stage 3 – 650 lb-ft torque
- Lockup torque converter with optional stall speeds for enhanced drivability
- Low RPM cruising capability for reduced engine wear and better fuel economy
- Electronic controller for precise shift timing and smoother transitions
- No tunnel cutting required, making it compatible with stock K-Series chassis
Why Choose A41X 4L60E for Your K-Series:
- Modern replacement for older 904, 727, 518, Powerglide, TH350, TH400, 200R4, and 700R4 transmissions
- Reduces cruising RPM by up to 30% for quieter, more efficient highway driving
- Dyno-tested for consistent torque handling and shift quality under load
- Ideal for off-road enthusiasts, towing, or heavy-duty daily driving
Included in the A41X 4L60E Conversion Kit:
- A41 Automatic Transmission (GM 4L60E / 4L65E aftermarket replacement)
- Transmission Bellhousing
- Lockup Torque Converter
- Rubber Cooling Line and Isolator Mount
- COMPUSHIFT Sport Controller with smartphone integration
- Bellhousing Dust Cover
- A41 to GM NP205 Adapter
- OEM-style Dipstick and Tube
- Auxiliary Oil Cooler (Stage 2 & 3; optional for Stage 1)
- Hardware Kit and Detailed Installation Instructions
COMPUSHIFT Sport Controller Highlights:
- Plug-and-play installation with all OEM connectors included
- Smartphone, tablet, and PC integration via Bluetooth and CAN bus
- Fully programmable shift strategies and two selectable driving modes
- Adjustable shift speed, shift feel, and torque converter clutch control
- Transfer case input for low-range 4WD calibration
- Highly durable IP65-rated, water- and dust-proof design
With the A41X 4L60E Conversion Kit, you get a modern, high-performance automatic transmission that fits your K-Series truck or SUV, improves acceleration, lowers engine RPM, and offers total control over shifting behavior. Perfect for off-road adventures, towing, or highway cruising, this kit transforms your classic GM 4WD truck into a capable, reliable, and modernized machine.
There are no featured galleries matching this product.
join our
email listYou’ll be first to know about Silver Sport Transmission products, discounts and special events!
Be the first to add a review for this product
Review Product