Transmissions for LS, LT and Custom Conversions

A complete UK technical resource for Tremec manuals and GM automatic transmissions from 4L60 to 10L80. Designed to support LS and LT crate engines, Ford V8s and a wide range of custom engineered applications. From high torque road cars to restorations, kit builds and motorsport projects, our range combines premium components with specialist knowledge and our in house ratio calculator.

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Manual Gearboxes

T56 Magnum, TR6060, TKX, and Magnum XL units. Suitable for LS and LT swaps, British classics, kit cars, retrofits and high performance builds.

Automatic Gearboxes

The full GM SuperMatic range: 4L60/4L70/4L75, 4L80, 6L80/6L90, 8L90 and 10L80. Ideal for modern repowers, boosted engines and heavy or off road applications.

Electronic Control & Integration

Standalone TCMs, CAN solutions, paddle-shift modules and plug in harnesses for complete gearbox control.

Installation Kits

Flexplates, bellhousings, adapter plates, clutch kits, torque converters, mounts, driveshaft solutions and hydraulic systems.

Your Powertrain Starts With the Right Transmission

This tool helps you plan a complete transmission package for your build by combining accurate gear ratio calculations with intelligent component matching. Enter your tyre size, final drive, and preferred gearbox, and the system will calculate speeds per gear and overall driveline characteristics in real time. Once you select your engine, it identifies the correct bellhousing, clutch, flexplate, converter, and controllers required for a fully compatible installation. It removes guesswork, avoids mismatched parts, and gives you a clear picture of how the transmission will perform before you commit to a purchase, making it easier to choose the right components for your project with confidence.

Manual Transmissions

Tremec T56 Magnum

A benchmark in high performance manual transmissions, capable of handling significant torque with consistent engagement. Popular for LS and LT swaps, track cars and high output road builds. Available in both GM and Ford configurations, with multiple shifter positions and slip yoke options.

Tremec TKX

Compact, lightweight and ideal for conversions where tunnel space is limited. Excellent for British classics, kit cars, restomods and smaller chassis layouts that still need modern strength and smooth shift quality.

TR6060

A robust six speed transmission known for its wide gear contact area and heavy duty synchroniser design. Often chosen for turbocharged builds, heavy performance cars or vehicles that see aggressive use.

Supporting Components

Bellhousings, hydraulic release bearings, slave cylinders, clutch kits, pilot bearings, shifters, mounts and driveshaft solutions to complete any manual installation.

Automatic Transmissions

4L60, 4L70 and 4L75 Series

Ideal for lighter vehicles or moderate power builds, with modern upgrades available including strengthened input shafts, improved clutch packs and enhanced valve body calibration. Popular for conversions where cost, packaging and parts availability are key.

4L80 Series

The standard for high torque builds. Suitable for boosted applications, heavy vehicles and off road conversions. Known for internal strength, predictable behaviour and wide aftermarket support.

6L80 and 6L90

A refined six speed platform with adaptive logic and efficient gear spacing. Used in many modern GM powered vehicles and increasingly popular in LS and LT repowers requiring smooth road manners.

8L90

A highly capable eight speed automatic with rapid shift response and excellent torque management. A strong option for LT powered projects and modern performance installations.

10L80

A compact ten speed transmission engineered for continuous torque delivery and exceptional efficiency. Provides very low cruising RPM, tight ratio control and refined behaviour for contemporary LT builds.

Torque Converters & Accessories

Performance converters, cooler kits, flexplates, adapters and OE style components from the SuperMatic range. Stall speeds, converter construction and internal strength are carefully matched to each application.

Transmission Control Systems

Modern GM transmissions require accurate electronic management. We stock complete controller kits, CAN modules, plug in harnesses, paddle shift systems and calibration hardware to configure any automatic for custom use.

These systems support LS, LT, Ford and stand alone applications, making them suitable for older platforms that never had electronic transmissions.

Installation Essentials

Flexplates, crank adapters, slip yokes, crossmembers, mounts, clutch packages, hydraulic systems, shifter assemblies and specialist hardware. Every component needed to complete a full installation, whether you are building a simple repower or a fully engineered custom drivetrain.

Ready to Build a Complete Drivetrain Package

From LS and LT repowers to universal conversions and specialist engineering projects, we supply every component needed to specify a gearbox correctly. Use our calculator, explore the range and contact us if you need a tailored package.

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