Portal Gear Lift 4 Inch Polaris RS1 30% Dual Idler

Portal Gear Lift 4 Inch Polaris RS1 30% Dual Idler

If you’re building a torque-dominating mud machine, the Portal Gear Lift 4 Inch Polaris RS1 30% Dual Idler from High Lifter delivers extreme low-end power, increased ground clearance, and serious drivetrain protection. Designed specifically for 2018–2022 Polaris RZR RS1 models, this heavy-duty portal system provides a true 4-inch lift combined with aggressive 30% gear reduction.

The upgraded dual idler gear design spreads load across twice as many gear teeth inside the gearbox. This doubles the contact surface area, reduces internal stress by half, and significantly improves torque transfer reliability under heavy throttle and oversized tire setups.

Why Choose 30% Dual Idler Reduction?

• 30% gear reduction – Massive torque multiplication for deep mud and technical terrain.
• Dual idler gear system – Increased tooth engagement for reduced gear stress.
• Improved engine braking – Extends brake life and enhances downhill control.
• Reduced belt and drivetrain wear – Helps protect axles, differentials, and driveshafts.

If you’re running larger tires and prioritizing power over speed, the 30% reduction option delivers the performance advantage needed to turn heavy setups with confidence.

Forged Gear Box Strength

This Portal Gear Lift 4 Inch Polaris RS1 30% Dual Idler features forged aluminum housings — stronger than cast or billet alternatives. Forging creates a denser, tougher metal structure capable of handling extreme shock loads and aggressive riding conditions.

• Heat-treated alloy steel gears
• CNC precision-ground machining
• Controlled gear lapping for quieter operation

Advanced Sealing & Protection

• Dual oil seals on spindle shaft for 100% more sealing area
• Triple-sealed input shaft including integrated wiper seal
• High-density Kevlar fiber gaskets (oil and coolant resistant)
• Optional gearbox venting capability for improved cooling

This layered sealing system helps prevent water intrusion and oil leaks even in extreme mud and wet riding environments.

Heavy-Duty Structural Components

• 5/16” steel backing plates with bent flanges for reinforcement
• Welded gusset brackets designed to factory offset
• Precision-ground stainless steel slotted rotors for improved brake cooling
• Compatible with control arms built to OEM hub specifications

Technical Specifications

• Lift Height: 4 Inches
• Gear Reduction: 30% Dual Idler
• Portal Boxes Included: 4
• Maximum Tire Size (Portals Only): 33”
• Maximum Tire Size (With Forward Arms): 35”
• Minimum Wheel Size: 14”
• 14” factory wheels require 1” spacer
• 14–15” wheels: Max 4.5” backspacing
• 16”+ wheels: Max 5” backspacing

Vehicle Compatibility

Fits 2018–2022 Polaris RZR RS1 models including EPS and Premium trims.

Upgrade your machine with the Portal Gear Lift 4 Inch Polaris RS1 30% Dual Idler and experience extreme torque multiplication, improved clearance, and heavy-duty reliability built for serious off-road abuse.

Cross-reference part/SKU numbers: PGL-430DI-RS1, 73-16586