Suzuki Jimny Sumo Gear Transfer Case Gear Set 15% High & 104% Low Reduction Automatic Transmission (05 - 18)

Suzuki Jimny 2005-2018 Sumo 15% / 104% Transfer Box Reduction Gears - Automatic

Upgrade the off-road capability of your Suzuki Jimny Generation 3 (2005-2018) with this premium Sumo full transfer box reduction gear kit, providing a 15% high-range reduction and a substantial 104% low-range reduction.

Designed specifically for Suzuki Jimny models fitted with a 4-speed automatic gearbox and electric push-button transfer box, this complete four-gear conversion is ideal for off-road enthusiasts looking to improve low-speed control, compensate for larger diameter tyres and increase the vehicle's crawling capability.

Manufactured in Japan by an original equipment (OE) gear manufacturer, Sumo reduction gears are precision-machined from high-quality billet material using advanced manufacturing equipment and tooling.

Designed for strength, reliability and smooth, quiet operation, these gears offer a comprehensive gearing upgrade for Jimny owners running larger off-road tyres.

IMPORTANT: Suitable for 4-speed automatic gearbox Jimnys with the electric push-button transfer box only. Not suitable for manual gearbox vehicles or earlier lever-operated transfer boxes.

15% High Range Reduction

Fitting larger diameter tyres to a Suzuki Jimny increases the effective overall gearing, which can reduce acceleration and make the engine work harder, particularly when climbing hills or driving at lower speeds.

The Sumo 15% high-range reduction helps compensate for this change by lowering the transfer box gearing, providing improved mechanical advantage at the wheels.

• Sumo high-range ratio: 1.522:1
• High-range reduction: 15%
• Recommended tyre size: 29"-30"

This reduction is particularly beneficial for Jimnys fitted with larger off-road tyres, helping restore more suitable gearing for everyday driving and general off-road use.

Please note: The high-range reduction also affects normal road driving. Engine RPM at a given road speed will increase compared with the original gearing when using the same tyre size.

104% Low Range Reduction

The substantial 104% low-range reduction provides significantly lower gearing for technical off-road driving, allowing the Jimny to crawl over difficult obstacles at much slower speeds.

This makes the kit particularly suitable for vehicles tackling steep climbs, rocky terrain, deep ruts and demanding off-road conditions.

• Sumo low-range ratio: 5.407:1
• Low-range reduction: 104%
• Recommended tyre size: 29"-30"

Benefits include:

• Significantly improved low-speed off-road control
• Greater torque multiplication at the wheels
• Improved control on steep climbs and descents
• Better gearing for larger diameter off-road tyres
• Greater control when manoeuvring over rocks, ruts and difficult obstacles
• Improved crawling capability in demanding off-road conditions
• Improved mechanical advantage when negotiating challenging terrain

Complete Four-Gear Transfer Box Conversion

Unlike partial reduction gear conversions that change only high-range or low-range gearing, this Sumo full reduction gear kit includes the four replacement gears required to alter both ranges.

The kit combines the 15% high-range reduction with the 104% low-range reduction, providing a comprehensive gearing upgrade for off-road use.

All four gears are precision-machined in Japan from high-quality billet material by an OE gear manufacturer.

Precision-Machined Japanese Sumo Gears

Sumo gears are manufactured in Japan by an experienced OE gear manufacturer using high-quality billet material and precision machining processes.

Each gear is manufactured using modern machinery and tooling to achieve the accuracy required for reliable transfer box operation.

The emphasis on manufacturing quality is intended to provide:

• Strength and durability
• Reliable operation
• Accurate gear engagement
• Smooth, quiet running
• Consistent manufacturing quality

Ideal for 29"-30" Tyres

This Sumo reduction gear kit is recommended for Suzuki Jimnys running 29"-30" tyres.

When larger tyres are fitted, the effective gearing becomes taller, which can reduce the vehicle's available pulling power at the wheels.

By reducing high-range gearing by 15% and low-range gearing by 104%, the Sumo conversion helps compensate for the increased tyre diameter while providing substantially improved low-speed off-road capability.

Features

• Manufactured by Sumo Gear
• Made in Japan
• Manufactured by an OE gear manufacturer
• Precision-machined from high-quality billet material
• Complete four-gear transfer box conversion
• 15% high-range reduction
• 104% low-range reduction
• Designed for smooth, quiet operation
• Improved gearing for larger diameter tyres
• Recommended for 29"-30" tyres
• Suitable for 4-speed automatic gearbox Jimnys
• Designed for electric push-button transfer boxes
• Includes input gear, sprocket drive gear, low gear and idler gear

Specifications

• Manufacturer: Sumo Gear
• Country of manufacture: Japan
• Vehicle: Suzuki Jimny Generation 3
• Model years: 2005-2018 (subject to transfer box type)
• Main gearbox: 4-speed automatic only
• Transfer box type: Electric push-button operated
• Gear construction: Precision-machined billet material
• High-range reduction: 15%
• Low-range reduction: 104%
• Modified high-range ratio: 1.522:1
• Modified low-range ratio: 5.407:1
• Recommended tyre size: 29"-30"

Kit Contents

This complete Sumo reduction gear kit includes:

• 1 x Input Gear - Jimny Type 4 & 5
• 1 x Sprocket Drive Gear - Jimny Type 5
• 1 x Low Gear - Jimny Type 5
• 1 x Idler Gear - Jimny Type 5

Please note: The kit contents listed above are the components specified by Sumo. Additional installation consumables, seals or gaskets are not listed as included.

Vehicle Fitment

Designed for Suzuki Jimny Generation 3 models fitted with a 4-speed automatic gearbox and electric push-button transfer box.

• Suzuki Jimny - 2005-2018
• 4-speed automatic gearbox only
• Electric push-button transfer box

IMPORTANT: This kit is for automatic gearbox Jimnys with the electric push-button transfer box only. It is NOT suitable for manual gearbox vehicles or earlier lever-operated transfer boxes.

Please check both your main gearbox and transfer box type before ordering, particularly on vehicles near the model changeover period or those fitted with replacement transfer boxes.

Installation Information

Installation requires removal and dismantling of the transfer box to replace the original gearing with the supplied Sumo reduction gears.

As installation involves internal transfer box components, professional installation or experience with transfer box rebuilding is recommended.

Installation Instructions:

Instructions Click Here

Please note: The linked instructions are supplied by Trail-Gear for their Jimny electric push-button transfer box gear conversion. They are provided for general transfer box dismantling and assembly reference only and are not specific Sumo installation instructions. Follow the correct installation requirements for the Sumo kit.

Important Information

• 4-speed automatic gearbox models only.
• Electric push-button transfer boxes only.
• Not suitable for manual gearbox vehicles.
• Not suitable for earlier lever-operated transfer boxes.
• High-range gearing reduced by 15%.
• Low-range gearing reduced by 104%.
• Both high-range and low-range gearing are changed by this conversion.
• Recommended for vehicles running 29"-30" tyres.
• Manufactured in Japan from precision-machined billet material.
• Kit includes four replacement transfer box gears.
• Additional installation consumables may be required.
• Professional installation or experience rebuilding transfer boxes is recommended.

Please confirm your vehicle has a 4-speed automatic gearbox and electric push-button transfer box before ordering.