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TREMEC TKX, TREMEC Magnum & SST A41 Conversion Kits for MOPAR E-Body: AAR, Barracuda, Challenger, Cuda, Gran Coupe, R/T, SE and T/A

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Enjoy Life in Overdrive

TREMEC Conversion Kits for MOPAR E-Body

Silver Sport Transmissions has the best-engineered kits to modernize the powertrain of your 1970-1974 Mopar E-Body. Our PerfectFit™ Kits bring the shifter handle to the factory-correct position for the best possible fit and our billet shifter tower provides short, crisp shifts.

Car shows, close friends, and good times are all within easy reach when you choose a TREMEC TKX 5-speed, T56 Magnum 6-speed, or Silver Sport Transmissions A41 4-speed automatic overdrive from SST!

The TREMEC TKX 5-Speed is the newest and most compact transmission from TREMEC.  Capable of handling up to 600 lb-ft torque and 7,500 rpm shifts, the TKX is strong enough to handle most street applications. Our TKXs have been modified to give you a factory-correct shifter position so your car will retain the factory look.  They also come with a crossmember to keep your driveline angles in spec. Find out why people call this powertrain upgrade the best improvement they've made to their car! 

The TREMEC Magnum 6-speed is quickly gaining in popularity as more and more people opt for larger engines. The 6-speed has two overdriven gears and can handle up to 700 lb-ft torque and 7,800 rpm shifts. Although it's certainly capable of handling the abuse of the track, it's also great for everyday use.  Our short throw shifter tower turns a great transmission into one of the best out there and our PerfectFit™ kit will let you keep a factory look with modern performance.

Silver Sport Transmissions A41 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. Switch from a gas-saving economy mode to performance mode with a flip of a switch or go from performance to high performance, you set the custom shift points!

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. 

 

Request a Quick Quote

 

Tremec TKX PerfectFit™ Kit for 1970-74 E Body

When you convert to the Tremec TKX 5 Speed, you will experience:

  • Compact, rounded case - No cutting
  • Capable of handling 600 lb•ft torque
  • Capable of 7,500 rpm shifts
  • 30-50% increase in fuel economy
  • Low RPM cruising
  • Reduced NVH (noise - vibration - harshness)
  • Interchangeable with mechanical or hydraulic clutch actuators by removing just a few bolts, no need to tear down the transmission
  • Designed for everyday street use - an ideal blend of brute strength and street manners

 

TKX Gear Ratios

Wide Ratio - 3.27, 1.98, 1.34, 1.00, 0.72
Close Ratio - 2.87, 1.89, 1.28, 1.00, 0.68 OR 0.81

Silver Sport Transmissions Overdrive Kit Overview

Mopar E Body 1970-1974 TREMEC TKX Kit

PerfectFit™ Tremec TKX Kit Components for conversion from 3 or 4-speed manual

  • TREMEC TKX 5 Speed Overdrive
  • STX Shifters® - True offset for a factory-correct shifter position
  • Pilot Bearing - Super heavy-duty needle roller type with lube seal for long life
  • Installation Hardware - Every bolt you need is included and clearly labeled
  • Isolator Mount - Rubber for vibration isolation or optional  heavy-duty poly for track duty
  • Reverse Lights Connector - Waterproof connector
  • Speedometer Connection - Mechanical and electronic compatible
  • Crossmember
  • Clutch Alignment Tool
  • Driveshaft & Slip Yoke - Lightweight, steel, custom driveshaft for superior strength. Dynamically balanced for smooth operation and premium solid u-joints come standard.
  • Detailed Installation Instructions - Including free lifetime tech support
  • Market Leading Warranty - learn more

Request a Quick Quote

 

Auto to Manual Conversions and Optional Parts

Mopar E Body 1970-1974 TREMEC TKX Kit Optional Parts

  • 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* - Choose from titanium-aluminum OEM type or steel scatter shields that meet race safety requirements.
  • Hydraulic Clutch Actuator Kit* - Modern technology with less pedal effort
    • Master cylinder - high-quality
    • 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* - Pistol grip handle with 5-speed shift pattern inlay
  • Tunnel Hump* - Replica manual transmission tunnel hump
  • Pedals* - Replica clutch and brake pedals, includes new pedal pads
  • Fluid - Break-In Fluid, transmission fluid, and hydraulic clutch fluid available for purchase

*Required for Automatic to Manual Conversions

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Why buy from Silver Sport Transmissions?

  1. Fast Shipping
    • Popular kits are in stock for short lead times
  2. Complete Kits
    • Why go to multiple sources for parts? Make one phone call and get things going on your project now.
  3. Excellent Customer Service
    • Lifetime tech support
    • Knowledgeable staff
  4. Premium Components
    • Only approved, high-quality parts are sold by SST.
  5. Engineering Know-How
    • Only SST has experienced and licensed engineers on staff. We know what fits, what works and how to install it.

 

Call today and let us assemble a custom kit just for you, or complete a Quick Quote

T56 Magnum 6-Speed PerfectFit™ Kit for E-Body

TREMEC Magnum PerfectFit Kit for Mopar E 1970-1974 Challenger Barracuda Cuda AAR Gran Coupe T/A SE R/T

Highway Cruising Double Overdrive!

Watch our short installation video of a TREMEC Magnum into a 1970 Challenger RT

 

Press: Hotrod Magazine

When you convert to the Tremec T56 Magnum 6 Speed, you will experience:

  • 30-50% increase in fuel economy
  • Low RPM cruising for greatly reduced driver fatigue and an improved highway driving experience. Road trips are fun again
  • Reduced engine wear leading to longer engine life
  • Cooler engine operating temperatures
  • Reduced NVH (noise - vibration - harshness)

 

Tremec T56 Magnum Gear Ratios

2.66, 1.78, 1.30, 1.00, 0.80, 0.63
2.97, 2.10, 1.46, 1.00, 0.80, 0.63

 

Silver Sport Transmissions PerfectFit Kit Overview
Keep your torsion bar suspension! Our kit does not require changing to coil over.

Tremec Magnum Basic Kit for Mopar E 1970-1974 Challenger Barracuda Cuda AAR Gran Coupe T/A SE R/TTremec T56 Magnum Kit Components

  1. Tremec T56 Magnum 6 Speed Double Overdrive
    • PerfectFit Shifter position fits inside the factory console
    • 700 torque capacity wide or close ratio.
    • Friction Lined Synchronizer Blocker Rings come standard for easy high RPM shifts
    • Market Leading Warranty - learn more
    • Optional Add the Front Shift Kit for bench seat clearance
  2. SFI Rated Steel Bellhousing
  3. Hydraulic Clutch Actuator Kit
  4. 6-Speed Pattern Shift Handle Insert
  5. Sheetmetal to widen the tunnel
  6. Speedometer Connection
    • Mechanical and electronic compatible
  7. Speedo Gear
  8. Reverse Light Connector
  9. Pilot Bearing
    • Super heavy-duty needle roller type with lube seal for long life
  10. Crossmember - No need to replace torsion bar suspension. Stronger than the original equipment crossmember.
  11. Isolator Mount
    • Rubber for vibration isolation 
  12. Installation Hardware
  13. Slip Yoke and Driveshaft
  14. Detailed Installation Instructions - including free lifetime tech support
  15. Market Leading Warranty - learn more

Optional components offered

  1. Flywheel Billet steel, not cast steel, for improved durability and safety.
  2. Clutch Kit
    • High performance, long life packages with easy pedal effort tailored to your needs
  3. Reproduction Shifter Handle (Wooden Look or Carbon Fiber)
  4. Cryogenic Gear Treatment
  5. Driveshaft Upgrades 

Why buy from Silver Sport Transmissions?

  1. Fast Shipping
    • Popular kits are in stock for short lead times
  2. Complete Kits
    • Why go to multiple sources for parts? Make one phone call and get things going on your project now.
  3. Excellent Customer Service
    • Lifetime tech support
    • Knowledgeable staff
  4. Premium Components
    • Only approved, high-quality parts are sold by SST.
  5. Engineering Know-How
    • Only SST has experienced and licensed engineers on staff. We know what fits, what works, and how to install it.

 

Call today and let us assemble a custom kit just for you.

A41 Automatic PerfectFit™ Kit for E-Body Mopar

A41 4L60E PerfectFit Automatic kit for Mopar E 1970-1974 Challenger Barracuda Cuda AAR Gran Coupe T/A SE R/T

 

 Loch's Testimonial and photos

The A41 4 Speed Automatic Transmission

Mopar A41

A41 Ratio: 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
  • Stand Alone Electronic Controller
  • Lockup Torque Converter with Optional Stall Speeds
  • No Tunnel Cutting 

 

The A41 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 rpms.

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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 quick plug and play setup. No wire splicing 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 that 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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A41 4L60E PerfectFit Kit for Mopar E 1970-1974 Challenger Barracuda Cuda AAR Gran Coupe T/A SE R/T

Each PerfectFit™ Kit comes with the correct components for your application and will include the following parts:

 

  1. Automatic Transmission - A41 (GM 4L60E / GM 4L65E Aftermarket replacement)
  2. COMPUSHIFT Sport Controller
  3. Dipstick and Tube - OEM Style
  4. Auxiliary Oil Cooler - High performance for Stage 2 and 3 only, Optional purchase for Stage 1 kits
  5. Bellhousing 
  6. Lock Up Torque Converter - Electronically controlled, stall options available 
  7. Throttle Position Sensor - Bolt-on unit provides throttle feedback to the computer with just 3 wires
  8. Braided Steel Cooler Lines* - (Rubber Cooler Lines for 1962-67)
  9. Speedometer Cable - Mechanical Speedo Cable
  10. Hardware - High strength grade 8 fasteners standard
  11. Wiring - Plug & Play wiring harness
  12. Inspection Cover
  13. Driveshaft* - High strength computer balanced with sealed u-joints & slip yoke (Slip Yoke only for 62-67)
  14. Reverse Light Wiring
  15. Crossmember* - Heavy-duty formed steel, powder-coated
  16. Isolator* - Vibration-free, heavy-duty rubber isolator

 

*Only Available for 68-74 Model Years

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