Gear Down and Go Big
We know you like to go big, and it doesn’t get any bigger than an 8” GDP Portal Gear Lift. That’s a heck of a lot of room for huge 40” tires and a ton of torque, thanks to the 45%, 60%, or 70% gear reduction. Get ultimate strength by pairing our 70% reduction with dual idler gears that never back down from a fight. Your Polaris RZR XP 1000 will feel like a whole new machine when you’re towering over the competition and throwing up rooster tails better than anybody else.
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.
45%, 60%, and 70% Gear Reductions Are Perfect for Mud
What’s the first thing you need if you’re serious about mud? A big lift. The second thing? Some big Assassinator Tires of course. And after that? The gear reduction to turn them. Our 8” portals have got you covered. You’ll have room to install huge 40” tires. And the 45, 60, and 70% gear reductions give you the most extreme torque to tear up the bounty hole. That way, you can push through and ride over deeper, thicker mud holes and take home the bounty.
A Gear Reduction That Protects Your Drivetrain
Portals put the gear reduction right in the hub. That puts it after your entire drivetrain and it makes your drivetrain work less and wear less. That means more miles out of your axles, differential, transmission, and prop shafts. Learn more about how tire size and gear reduction can unleash your machine’s potential. Stronger Housings and Backing Plates by Design GDP Portals are the strongest you can get because we know how to make them tough. We’ve been using them and refining them for years. Whether you go with cast or USA-made, 6061 billet aluminum housings (which look awesome), you’ll get unmatched strength through superior design. Combine that with 5/16” backing plates made with an advanced steel alloy, and you’ve got the brawniest portals on the market. 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
You need a SuperATV Frame Stiffener with your RZR 1000 Portals. The stock frame just doesn't have what it takes. Bump too hard and the OEM frame will bend. Trust us—we've done it. A frame stiffener reinforces your frame enough to let you ride your 8" portals with monster tires and no worries.
Top-Rated Customer Service
Still need a little help getting exactly what you need? We’ve got a dedicated team just for portal support. Give us a call so we can get the perfect set of portals in your hands today.
8” Portal Gear Lift Includes: (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 (2) Caliper adapter plates
(2) Rear hub adapters (for specific year models only) (2) Steel steering arms
(4) Shims (for specific year models only) Extended brake lines
All required hardware, including recessed castle nut socket
Frame stiffener (optional)
Polaris RZR XP 1000 Portal Gear Suspension Recommendations Max Tire Size Required Suspension Setup with 8" Portals 40" Stock 42" 1.5" Forward Front A-Arms 44" 1.5" Forward Front A-Arms and 3" Lift Kit 50" 7-10" Lift Kit
If you need help figuring out which gear reduction is right for you, check out our portal gear reduction calculator.
Max tire sizes are measured at full compression and full turn. The given tires sizes are the largest we fit without rubbing. With minor trimming or a small amount of rub, larger tire sizes can be used.
Patent # 11,299,042
Patent # 11,318,787
- Available with billet or cast aluminum housing
- Dual idler gear configuration maximizes strength
- Cool, quiet, precision ground gears made from 9310 alloy billet steel
- 1.5 in. forward and rear offset
- Increases width by 4 in. per side (8 in. total)
- 1.5 in. diameter 4340 hardened steel drive shaft
- Housings use advanced gaskets or O-rings that don’t let anything through
- Universal hub fits all major bolt patterns
- Gear reduction reduces stress on your drivetrain
- 22" or larger wheel required
- Wheels cannot exceed 5" backspacing
NOTE: Wheels need to have a center hole of at least 3.25" (82.55mm) or require a 1” wheel spacer.
