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TREMEC TR-4050 and SST A41X Conversion Kits for 1967-1972 K-Series

No Obstacles, No Horizon Too Far - 4WD Life

TREMEC TR-4050 and Silver Sport Transmissions A41X for 4WD K-Series GMC and Chevrolet Trucks and SUVs

Silver Sport Transmissions has the best-engineered kits to modernize the powertrain of your Chevy or GMC K series pickup truck or SUV. Our RestoFit® Kits bring the shifter handle to the factory-correct position for the best possible fit and our billet shifter tower provides short, crisp shifts.

Whether you plan to take your vehicle off-road, tow a camper or boat, or cruise the highway, our overdrive transmissions will help you get there.

The TREMEC TR-4050 5-Speed is the strongest 4WD transmission available on the market with a 600 lb-ft torque capacity. It's also brand new, with no remanufactured or rebuilt parts in the TR-4050. If you're stuck in the mud with your current transmission, the ultra-low 1st and rear gears can get you out of any sticky situation you have gotten yourself into! The overdriven 5th gear is perfect for the highway, reducing the NVH (noise/vibration/harshness) and improving your fuel mileage.

Silver Sport Transmissions A41X 4-Speed Automatic is based on the GM 4L60E transmission and comes in three performance stages.  It can handle anywhere from 450 to 650 lb-ft torque.  It's an excellent alternative to replace the original automatic and with the overdrive, it is an impressive upgrade. Customize your experience by programming two driving modes; switching between the two is as easy as flipping a switch!

Use the tabs above to learn more about each transmission or use the Speed Analyzer to determine which transmission will fit your car and driving style the best. 

 

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Tremec TR-4050 RestoFit® for K-Series Truck, K-5 Blazer, Jimmy, Suburban, and Carryall

The TR-4050 will help your "Action Line" K-series truck or SUV see more action than it has in years! The TREMEC TR-4050's super-low 6.16 1st and 6.03 reverse gears will help you navigate the trails. Meanwhile, the .76 overdrive will be very useful when you're on the highway headed to the next trail. The TREMEC TR-4050 will make sure even 10+ years later, you're still having fun out there.

 

When you convert to the TREMEC TR-4050 5-Speed, you will experience:

  • Low, rock crawling 1st gear (6.16) and reverse (6.03)
  • Excellent shift feel and performance
  • Crisp, precise shifts
  • Highway cruising with 5th overdrive gear (.76)

 

TREMEC TR-4050 Gear Ratios

6.16, 3.11, 1.71, 1.00, 0.76, and 6.03 Reverse

 

TREMEC TR-4050 Conversion Kit Components 

TREMEC TR-4050 5-Speed Conversion Kit for 1967-1972 GM K Series Truck and SUV

  • TREMEC TR-4050 5 Speed Overdrive
    • 600 lb•ft torque capacity
    • BRAND NEW! No remanufactured or rebuilt parts or case
    • High-contact, constant mesh, helical gears for maximum strength
    • Die-cast aluminum alloy housing saves weight while offering considerable rigidity
    • Standard right-hand, six-bolt PTO offers the ability to run hydraulic pumps
    • The multiple rail, internal shifter provides excellent shift feel and performance
    • Tapered bearing on input, main, and counter shafts provide excellent internal stability
    • Needle bearings under gears reduce friction and noise output
    • Fully synchronized
    • Advanced synchronizer technology promotes smoother shifting and reduced shift effort
    • 5th gear synchronizer mounted to the countershaft to improve NVH in overdrive
    • 3.67 qt oil capacity
  • Pilot Bearing 
  • Hardware
  • Reverse Light Wiring Pigtail
  • Crossmember Mount Template
  • Instructions
  • Factory Warranty - learn more

 

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Auto to Manual Conversions and Optional Parts

TREMEC TR-4050 Optional Parts K-Series Truck and SUV

  • SST Advanced Friction™ Flywheel* - Billet steel, not cast steel, for improved durability and safety 
  • SST Advanced Friction™ Series II Clutch* - High performance, long life packages with easy pedal effort tailored to your needs
  • Bellhousing Kit*
  • Hydraulic Clutch Actuator Kit* - Modern technology with less pedal effort
    • Master cylinder - high-quality Wilwood
    • Heavy-Duty concentric slave cylinder - 1,000,000 cycle service life
    • Pre-engineered firewall mount for master cylinder - eliminates guess-work for easy installation
    • Remote reservoir with hose
    • Braided steel pressure hose
    • Pedal pushrod and all hardware
    • Detailed installation instructions
  • Shifter Boot and Trim Ring* 
  • Shifter Handle* - A variety of shifter sticks from classic to modern to choose from.
  • Shifter Ball/Knob* - Available in white or black for that classic look. Engraved with a 5-speed shift pattern.
  • STX Shifter® - Short throw shifter
  • Transfer Case Adapter and Shifter Linkage Kit*
  • Mechanical Linkage Bracket
  • Fluid - Break-In Fluid, transmission fluid, and hydraulic clutch fluid available for purchase

*Required for Automatic to Manual Conversions

Click the 4WD Quick Quote button or call 865-609-8187 to get a detailed estimate.

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Why buy from Silver Sport Transmissions?

  • Fast Shipping
  • Complete Kits
  • Excellent Customer Service
    • Lifetime tech support
    • Knowledgeable staff
  • Premium Components
    • Only SST has experienced and licensed engineers on staff. We know what fits, what works, and how to install it.

 

A41X 4-Speed Automatic GM K-Series

This is the basic builder's kit, cutting and/or fabrication will be required for installation.

A41X for 1967-1972 Chevy/GMC K Series A41X Ratios: 3.06, 1.63, 1.00, 0.70

 

Available in three stages:

Stage 1 - 450 Torque
Stage 2 - 550 Torque
Stage 3 - 650 Torque

 

Features:

  • Low RPM Cruising
  • Great Shift Quality
  • Dyno Tested
  • Electronic Controller
  • Lockup Torque Converter with Optional Stall Speeds
  • No Tunnel Cutting 

 

The A41X is an excellent way to replace your tired 904, 727, 518, Powerglide, TH350 (Turbo 350), TH400 (Turbo 400), 200R4 (200-4R), or 700R4 with modern technology that offers better acceleration and a 30% reduction in cruising rpm.

 

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COMPUSHIFT Sport

COMPUSHIFTThe COMPUSHIFT Sport is the next generation of transmission controllers.

  • All the connectors - The COMPUSHIFT Sport transmission controller looms come with a full set of Plug and Play OEM Connectors for all supported transmissions - making installation effortless.
  • Smart Phone Integration - COMPUSHIFT Sport brings you the first-ever smartphone integrated transmission controller. This makes programming dead easy – allowing programming via Android or iOS smartphones, tablets, PCs, and Macs. Connectivity includes both Bluetooth and dual independent CAN bus networks. All software is included.
  • Fully Customize Your Transmission - Get full and precise control of the shifting strategy for your transmission. COMPUSHIFT Sport and Pro are delivered with versatile factory-set programming for a wide variety of transmission and engine combinations. However, you can completely customize settings to your exact specifications.

 

COMPUSHIFT Sport Technical Specifications

COMPUSHIFT

Smart Phone / Tablet / Computer Integration:

  • COMPUSHIFT Sport brings you the first-ever smartphone integrated transmission controller. This makes programming dead easy – allowing programming via Android or iOS smartphones, tablets, PCs, and Macs. Connectivity includes both Bluetooth and dual independent CAN bus networks. All software is included.

 

Control:

  • Get full and precise control of the shifting strategy for your transmission. COMPUSHIFT Sport and Pro are delivered with versatile factory-set programming for a wide variety of transmission and engine combinations. However, you can completely customize settings to your exact specifications.
  • Fully adjustable shift speeds, shift feel, and torque converter clutch control.
  • Provides adjustable output for speedometer calibration.

 

Compatibility:

  • COMPUSHIFT has the capability of communicating with many different factory and aftermarket engine controllers for a quick plug-and-play setup. No wire splicing is required.
  • Uses industry-standard trouble codes

 

Ease of Setup:

  • All The Connectors - The COMPUSHIFT Sport transmission controller looms come with a full set of Plug and Play OEM Connectors for all supported transmissions - making installation effortless.
  • COMPUSHIFT software is upgradeable in the field via Bluetooth. Updates are available via Google Play, Kindle, and the Apple App Store.
  • Two full sets of calibration modes can be selected by button or app.
  • Transfer case switch input for shift/speedometer calibration in low range / 4WD vehicles.

 

Durability:

  • Highly Water and Dust Proof - IP65 Rated

 

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A41X Automatic Kit for GM K Series

  • Automatic Transmission - A41 (GM 4L60E / GM 4L65E Aftermarket replacement)
  • Bellhousing
  • Lockup Torque Converter
  • Rubber Cooling Line
  • Hardware
  • Isolator Mount
  • COMPUSHIFT Sport Controller
  • Bellhousing Dust Cover
  • A41 to GM NP205 Adapter
  • Dipstick and Tube - OEM Style
  • Auxiliary Oil Cooler - High performance for Stage 2 and 3 only, Optional purchase for Stage 1 kits
  • Bellhousing
  • Instructions

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