Jimny Trail Gear Transfer Case Reduction Gears 15% High and 104% Low (Automatic)

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

Upgrade the off-road capability of your Suzuki Jimny 2018-on (JB64 / JB74) with this heavy-duty Trail-Gear transfer box reduction gear kit, specifically designed for Generation 4 Jimny models fitted with an automatic gearbox.

These reduction gears reduce the transfer box gearing by 15% in high range and 104% in low range, providing substantially lower gearing, improved low-speed control and increased torque multiplication at the wheels when driving off-road.

The kit is suitable for the lever-operated, chain-drive transfer box fitted to the Generation 4 Suzuki Jimny with an automatic gearbox, making it an excellent upgrade for vehicles running larger tyres or tackling demanding off-road terrain.

IMPORTANT: Suitable for automatic gearbox models only. Not suitable for manual gearbox vehicles.

15% High Range Reduction

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

This can improve drivability when running oversized tyres, particularly at lower speeds and when climbing hills.

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% reduction in low range provides much lower crawling speeds, allowing greater control over difficult off-road obstacles.

Benefits include:

• Improved low-speed control on challenging terrain
• Greater torque multiplication at the wheels
• Improved control on steep climbs and descents
• Better gearing for larger off-road tyres
• Greater control when manoeuvring over difficult obstacles
• Reduced reliance on the brakes when descending steep off-road terrain

Heavy-Duty SCM415 Alloy Steel Gears

The gears are manufactured from high-strength SCM415 alloy steel and are heat-treated and carburised for durability in demanding off-road conditions.

The kit includes four replacement gear components together with the necessary seals, staking nuts and installation sealant.

Specifications

• Manufacturer: Trail-Gear
• High-range reduction: 15%
• Low-range reduction: 104%
• Gear material: Heat-treated and carburised SCM415 alloy steel
• Recommended tyre size: 29" (approximately 736mm) and larger
• Transfer box type: Lever-operated, chain-drive transfer box
• Transmission: Automatic gearbox only
• Vehicle generation: Suzuki Jimny Generation 4 (2018-on)

Kit Contents

• 1 x New input shaft
• 1 x Low-range output gear
• 1 x Sprocket output gear
• 1 x Countershaft gear
• 3 x Trail-Safe transfer box input/output oil seals
• 3 x New staking nuts
• 1 x Tube of Ultra Grey RTV silicone sealant

Vehicle Fitment

IMPORTANT: This kit is suitable for automatic gearbox models only.

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

Designed for Generation 4 Suzuki Jimny models fitted with an automatic gearbox and the original 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.

Minor clearancing of the transfer box housing is required to accommodate the replacement gears.

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 were originally produced for the older Generation 3 JB43 electric push-button transfer box. The Generation 4 lever-operated transfer box shares many similar internal components, so the installation procedure is similar, although some steps may differ.

Important Information

• Automatic gearbox models only - not suitable for manual vehicles.
• Reduces high-range gearing by 15% and low-range gearing by 104%.
• Both high-range and low-range gearing are changed by this conversion.
• Recommended for vehicles running 29" tyres or larger.
• Minor clearancing of the transfer box housing is required during installation.
• Installation instructions are based on the older JB43 electric transfer box and may differ slightly from the Generation 4 transfer box.
• Professional installation or experience rebuilding transfer boxes is recommended.

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