SuperATV - Can-Am Defender / Defender MAX HD8 8" Portal Gear Lift

Turn Your Defender HD8 into a Powerhouse

Your Can-Am Defender HD8 is built for versatility, but SuperATV's 8" GDP Portals push it far beyond stock performance. This upgrade delivers a full 8 inches of lift along with a built-in gear reduction that boosts torque where you need it most. Tackle rough terrain with greater clearance and confidently upgrade to larger tires. With options for 45%, 60%, or 70% gear reductions and your choice of billet or cast housings, you can fine-tune your setup for work or play.

What is a Dual Idler?

After years of research and development, SuperATV's dual idler gear portals are unlike any other. By placing a second idler gear in the portal box, the load gets spread over twice as much surface area for more reliable torque transfer and the strongest gear set available. Precision CNC grinding ensures perfect mating. Gears are made from the industry's toughest 9310 steel alloy.

Conquer All Terrain

These 8" GDP Portals are highly customizable to your needs. Select either a 45%, 60%, or 70% gear reduction, depending on how much low-end torque or top-end performance you want. Both options deliver serious strength, giving you the confidence to conquer rocky terrain, run bigger tires, and cut through deep mud with total control.

Reduce Stress on Your Drivetrain

With GDP Portals installed on your Defender HD8, the gear reduction happens right at the hub rather than inside the transmission. This design helps shield your drivetrain from unnecessary strain by easing the load on critical parts like the axles, driveshaft, differential, and transmission. This added protection can mean fewer repairs and more time on the trail.

Ultra-Strong Build

SuperATV's GDP Portals for the Defender HD8 are available in cast or billet aluminum housings, engineered for long-lasting performance. Heavy-duty 5/16" steel alloy backing plates deliver unmatched strength. A lifetime warranty gives you added confidence every time you hit the trail.

• Housings are reinforced for gear retention and optimized for oil flow
• Advanced steel alloy backing plates are stronger than chromoly
• No vents—vents do more harm than good
• Enhance with Portal Blood gear oil formulated for GDP Portals

Advanced Gaskets, Seals, and Bearings

• Advanced gaskets and O-rings with excellent oil resistance and low deterioration rates
• Sealed input gear and double-lipped output seal
• 100% sealing coverage throughout to prevent oil leaks
• Double-angular contact output bearings to prevent premature wear
• Roller idler and drive bearings to maintain perfect gear meshing

Frame Stiffener Required

An 8" portal lift paired with oversized tires can transform your Can-Am Defender HD8, but that extra capability comes with added strain on the frame. SuperATV's Frame Stiffener is designed to handle it, giving your machine the reinforcement it needs to stay rigid and reliable.

Key Features

• Available with billet or cast aluminum housings
• Dual idler gear configuration maximizes strength
• Cool, quiet, precision-ground gears made from 9310 alloy billet steel
• 1.5 in. diameter 4340 hardened steel drive shaft
• Housings use Thermo-Tork gaskets or O-rings
• Universal hubs work with bolt patterns: 4/156, 4/137, 4/115, and 4/110
• 1.5" front and rear offset—3" total extension

What's Included

• (4) Assembled portal hub boxes complete with 9310 gears, seals, output shaft, gaskets, and thrust bearings
• (4) Universal hubs and precision-ground stainless steel slotted rotors with lugs
• (4) Specialized steel alloy backing plates
• (4) Steel caliper mounting plates
• Extended brake lines
• Steering stop kit (dual idler configuration only)
• All required hardware, including recessed castle nut socket
• Frame stiffener (must select at checkout)

Suspension Recommendations

Max tire sizes are measured at full compression and full turn. Larger tire sizes can be used with minor trimming or a small amount of rub.