To avoid any fitment issues, please make sure to select the exact year, make and model of your vehicle. If you are unsure, please reach out to us for assistance prior to purchasing. Not that this part is built-to-order and NON-RETURNABLE. This part must be installed by a licensed professional to avoid any issues related to the complex installation

Turn Your Ride into a Powerhouse
Your machine 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?
Perfection takes time. After years of research and development, we've made our dual idler gear portals 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 you can get. Two idler gears don't do a thing if they're not mated perfectly, though. Precision CNC grinding ensures ours do. Our gears are made from the industry's toughest 9310 steel alloy. Didn't think dual idlers mattered? With GDP’s quality and experience, they finally do.

Conquer All Terrain
What makes our 8" GDP Portals stand out is how customizable they are to your needs. You can 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. It's all about building your machine your way.

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. In the long run, that added protection can mean fewer repairs and more time on the trail.

Ultra-Strong Build
You need parts that won't quit, and SuperATV's GDP Portals deliver exactly that. They're available in cast or billet aluminum housings, so they're engineered for long-lasting performance. Add in heavy-duty 5/16" steel alloy backing plates, and you get unmatched strength where it counts. Ride hard, work harder—these portals are made to handle it all. Plus, a lifetime warranty gives you added confidence every time you hit the trail.

• Our housings are reinforced for gear retention and optimized for oil flow
• Advanced steel alloy backing plates are stronger than chromoly
• Enhance with Portal Blood—gear oil formulated for GDP Portals
• There are no gimmicks and no vents because vents do more harm than good—we know because we tested them

Advanced Gaskets, Seals, and Bearings
Our portals use:

• Advanced gaskets and O-rings with excellent oil resistance and low deterioration rates
• A sealed input gear and double-lipped output seal
• 100% sealing coverage throughout so you can forget about 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 ride, 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. It's built to keep your frame from flexing under demanding conditions.

8" Portal Gear Lift Includes:

• Assembled portal hub boxes complete with 9310 gears, seals, output shaft, gaskets, and thrust bearings
  Universal hubs and precision-ground stainless steel slotted rotors with lugs
• Specialized steel alloy backing plates
• 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)

Portal Gear Suspension Recommendations

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 that don't let anything through
• Universal hubs can be set up to work with the following bolt patterns: 4/156, 4/137, 4/115, and 4/110
• Gear reduction reduces stress on your drivetrain
• 1.5" front and rear offset—3" total extension