Jimny SUMO GEAR Transfer Case Reduction Gears 15% High and 104% Low (Automatic)

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

Upgrade the off-road capability of your Suzuki Jimny 2018-on (JB64 / JB74) with these high-quality Sumo Gear transfer box reduction gears, manufactured in Japan for Generation 4 Jimny models fitted with a 4-speed automatic gearbox.

These reduction gears provide a 15% reduction in high range and a substantial 104% reduction in low range, helping compensate for larger diameter tyres while providing much lower crawling speeds for demanding off-road terrain.

Manufactured from high-quality billet material and precision-machined in Japan by an original equipment gear manufacturer, Sumo gears are designed with an emphasis on strength, reliability and smooth, quiet operation.

IMPORTANT: Suitable for 4-speed automatic gearbox models with the original lever-operated transfer box only. Not suitable for manual gearbox vehicles.

15% High Range Reduction

The 15% high-range reduction helps compensate for the increased overall gearing caused by fitting larger diameter tyres.

This can improve low-speed drivability and help restore some of the mechanical advantage lost when upgrading from standard tyres to larger off-road tyres.

• Original high-range ratio: 1.32:1
• Sumo high-range ratio: 1.522:1
• Reduction: Approximately 15%

Please note: High-range gearing will also be reduced during normal road driving, resulting in higher engine RPM at a given road speed compared with standard gearing.

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 running larger off-road tyres and regularly tackling steep climbs, rocky terrain and challenging green lanes.

• Original low-range ratio: 2.644:1
• Sumo low-range ratio: 5.102:1
• Reduction: 104% (manufacturer specification)

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
• Reduced reliance on the brakes when descending steep off-road terrain

Precision Manufactured in Japan

Sumo Gear reduction gears are manufactured in Japan by an original equipment gear manufacturer using precision machining equipment and high-quality billet material.

Each gear is designed with strength, reliability and accurate gear engagement in mind, helping provide smooth and quiet operation.

These gears are an excellent choice for Jimny owners looking for a quality Japanese-made gearing upgrade with a substantial low-range reduction for serious off-road use.

Features

• Manufactured in Japan by Sumo Gear
• 15% high-range reduction
• 104% low-range reduction (manufacturer specification)
• High-quality billet gear construction
• Precision-machined by an original equipment gear manufacturer
• Designed for strength, reliability and smooth operation
• Helps compensate for larger diameter tyres
• Recommended for 29"-31" tyres
• Significantly lower crawling speeds in low range
• Designed for the Generation 4 Suzuki Jimny
• Suitable for 4-speed automatic gearbox models only

Specifications

• Manufacturer: Sumo Gear
• Country of manufacture: Japan
• High-range reduction: Approximately 15%
• Low-range reduction: 104% (manufacturer specification)
• Original high-range ratio: 1.32:1
• Modified high-range ratio: 1.522:1
• Original low-range ratio: 2.644:1
• Modified low-range ratio: 5.102:1
• Recommended tyre size: 29"-31" (approximately 736-787mm)
• Transmission: 4-speed automatic gearbox only
• Transfer box: Lever-operated transfer box
• Vehicle generation: Suzuki Jimny Generation 4 (2018-on)

Vehicle Fitment

IMPORTANT: Suitable for 4-speed automatic gearbox models only.

• Suzuki Jimny JB64 - 2018-on (4-Speed Automatic)
• Suzuki Jimny JB74 - 2018-on (4-Speed Automatic)
• Suzuki Jimny Sierra - 2018-on (4-Speed Automatic)

Designed for Generation 4 Suzuki Jimny models fitted with the original 4-speed automatic gearbox and lever-operated transfer box.

NOT suitable for manual gearbox models.

Installation Information

Installation requires removal and dismantling of the transfer box to replace the original gearing.

Due to the mechanical work involved, professional installation or experience with transfer box rebuilding is recommended.

Installation Instructions:

Instructions Click Here

Please note: These instructions are produced by Trail-Gear for their own reduction gears and show the older Generation 3 JB43 electric push-button transfer box. They are provided as a reference guide only, as the Generation 4 lever-operated transfer box shares many similar internal components. The Sumo gears are a different product, so some installation steps may differ.

Important Information

• 4-speed automatic gearbox models only - not suitable for manual vehicles.
• High-range reduction of approximately 15%.
• Low-range reduction stated as 104% by the manufacturer.
• Both high-range and low-range gearing are changed by this conversion.
• Recommended for vehicles running 29"-31" tyres.
• Manufactured in Japan by Sumo Gear.
• The linked Trail-Gear installation instructions are provided for reference only and are not specific to this Sumo kit.
• Professional installation or experience rebuilding transfer boxes is recommended.

Please confirm your vehicle has a 4-speed automatic gearbox and the original lever-operated transfer box before ordering.