Polaris Sportsman 850 15% Dual Idler 4 Inch Portals

• The dual idler gears spread the load over twice as many teeth on the gear sets, which doubles the area and reduces stress by half
• More reliable torque transfer
• 15% gearing extends brake life by needing brakes less often due to greatly improved engine braking

Gear Box Features:

• Strongest boxes on the market because forging produces a tougher piece of metal
• Forging is stronger than both cast and billet aluminum
• Extremely robust and give you more worry-free miles
• Offers a plug for venting with an optional easy to install kit that will be available soon
• Vent kits allow an advantage of cooling which reduces early deterioration of the gaskets and seals

Gasket and Seal Features:

• High density Kevlar fiber gaskets plus no additional sealant is needed
• Creep resistant plus oil and coolant resistant
• Two oil seals on the spindle shaft for 100% more sealing area
• Dual seals prevent water intrusion and oil leaks
• True triple seal on the input shaft which includes a wiper seal that provides a significant extra layer of protection

Backing Plate Features:

• Strongest backing plates on the market
• 5/16” steel plate with bent flanges for strength and durability
• Welded gusset brackets and designed to factory off-set
• Works with most control arms that are built to factory hub specifications

Rotor Features:

• Precision ground stainless steel rotors
• Access holes for ease of assembly and disassembly
• Slotted rotor allows for heat dissipation and cooling

Gear Features:

• Alloy steel heat treating process increases overall internal and external strength
• CNC precision ground machining ensures excellent fitment and increased strength
• Controlled gear lapping for ease of installation and a quieter performance