73-16587 – Portal Gear Lift 4 Inch Polaris RS1 15% Dual Idler

Portal Gear Lift 4 Inch Polaris RS1 15% Dual Idler

If you’re looking for serious torque multiplication and drivetrain protection, the Lift 4 Inch Polaris RS1 15% Dual Idler system from High Lifter delivers the strength and performance your machine demands. Designed specifically for Polaris RZR RS1 models, this heavy-duty portal setup adds a true 4 inches of lift while providing a balanced 15% gear reduction for improved low-end power without sacrificing trail speed.

Unlike standard portal systems, this dual idler design spreads the load across twice as many gear teeth. That increased surface contact reduces stress, improves torque transfer, and enhances long-term durability under aggressive riding conditions.

15% Dual Idler Performance Advantage

• 15% gear reduction – Ideal balance between torque and ride speed.
• Dual idler gears – Doubles tooth engagement and cuts stress in half.
• Improved engine braking – Reduces brake wear and improves downhill control.
• Less drivetrain strain – Helps protect belts, axles, differentials, and driveshafts.

If you’re running larger tires but still want responsive trail performance, this reduction ratio provides reliable power where you need it most.

Forged Gear Box Strength

This Portal Gear Lift 4 Inch Polaris RS1 15% Dual Idler features forged aluminum gear boxes — stronger than cast or billet alternatives. Forging creates a denser metal structure, delivering superior durability and resistance to shock loads in extreme mud and trail environments.

• Alloy steel heat-treated gears
• CNC precision-ground machining
• Controlled gear lapping for smoother, quieter operation

Advanced Sealing & Protection

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

This multi-layer sealing system prevents water intrusion and oil leaks, ensuring long-term reliability in harsh riding conditions.

Heavy-Duty Structural Components

• 5/16” steel backing plates with bent flanges for strength
• 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: 15% 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 Lift 4 Inch Polaris RS1 15% Dual Idler and experience increased clearance, improved torque transfer, and heavy-duty drivetrain protection built for serious off-road performance.

Cross-reference part/SKU numbers: PGL-415DI-RS1, 73-16587