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Can-Am Defender 4" Portal Gear Lift — Single / Kit 2 (See Fitment Tab) / Yes, I have a Big Lift Kit.

Original price $2,499.95 - Original price $3,615.90
Original price
$2,499.95
$2,499.95 - $3,615.90
Current price $2,499.95
Availability:
Only 1 left!
Availability:
Only 1 left!
Availability:
Only 1 left!
Availability:
Only 1 left!
Availability:
Only 1 left!
Availability:
Only 1 left!
Availability:
Only 1 left!
Availability:
Only 1 left!
Portal Housing Material: Cast
Portal Gear Reduction: 15%
Do you need a frame stiffener?: No, I already have a frame stiffener.

Free returns on all eligible orders

You have 30 days to request a return. All sale items are final sale.

GDP Portals Will Revamp Your Ride
GDP didn’t make the first side-by-side portal kit on the market—just the first kit that anybody gave a damn about. If you’re looking for a way to completely redefine your Can-Am Defender, look no further than SuperATV’s GDP 4” Portal Gear Lift. Choose between a 15% or 30% gear reduction, and add a dual idler gear for strength that you can’t find anywhere else. Get ready to discover why GDP is the most respected name in the portal game.

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.

Perfect for All Riding Styles
It doesn’t matter where, when, or how you ride—there’s a GDP Portal Gear Lift for you. From the trails to mud bogs to wide-open dunes, our portals make every ride better. Get a 15% gear reduction to enjoy speedy rides and a torque boost. Or go for a 30% gear reduction to really gear down and turn those monster tires. You can even add a dual idler gear for ultimate strength. Our Can-Am Defender dual idler portals are perfect for riders who don’t slow down for anything.

A Gear Reduction That Protects Your Drivetrain
Portals put the gear reduction right in the hub, after your transmission, prop shaft, differential, and axles. That means it reduces stress on your entire drivetrain. You get more power and your most vital components will last longer, too. That’s a win-win.

Nothing Is Stronger Than GDP
We know how you ride—pedal to the metal, full send, the whole nine yards. That’s why we made sure GDP portals are the strongest on the planet. They’re available with cast or billet aluminum housings that are thicker and stronger than any other portal housings on the market. And they have 5/16” thick backing plates made from an advanced steel alloy. All of that comes together to bring you the best damn portal gear lift imaginable.

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

Complete the Package with a Frame Stiffener
Portals and monster tires are fun, but they can place additional stress on your machine’s frame. To make your suspension bulletproof, we recommend adding a SuperATV Frame Stiffener when you install your new Can-Am portals!

Top-Rated Customer Service
Still need a little help getting exactly what you need? With GDP, you get a dedicated portal tech support team. Give us a call so we can get the perfect set of portals in your hands today.

4” Portal Gear Lift Includes:
(4) Assembled portal hub boxes complete with 9310 gears, seals, output shaft, gaskets, and thrust bearings.
(4) Universal hubs and stainless steel slotted rotors with lugs
(4) Specialized steel alloy backing plates
(4) Steel caliper mounting plates
(2) Steel steering arms
Extended brake lines
All required hardware, including recessed castle nut socket
Frame stiffener (optional)


Max Tire Size Recommendations for 4” Portal Gear Lift
Max Tire Size Required Suspension Setup with 4" Portals
26" Stock
27" 3" Lift Kit
28" to 34" 2" Forward Offset A-Arms
28" to 38" 6" 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

Frequently Asked Questions (FAQ)

Is a 4-inch portal gear lift better than a standard lift kit for a Can-Am Defender 4?

Yes. A 4-inch portal gear lift gives you both ground clearance and torque—not just height like a standard lift kit. By moving the gear reduction to the hub, portals reduce stress on axles, differentials, and the transmission while allowing you to run larger tires with confidence.

Will this portal gear lift fit my Can-Am Defender 4 or Defender MAX?

This portal gear lift is machine-specific and engineered to fit select Can-Am Defender and Defender MAX models listed in our fitment guide. Always check the fitment tab on the product page to confirm compatibility with your exact year and model.

How hard is it to install a SuperATV 4-inch portal gear lift?

Installing portals is more involved than a basic lift because they replace the hubs and integrate gear reduction. We include detailed step-by-step instructions, extended brake lines, and all required hardware to make installation as straightforward as possible for experienced DIY riders.

What gear reduction options are available and how do I choose one?

We offer 15% and 30% gear reduction options. A 15% reduction maintains higher trail speed with added torque, while 30% is ideal for heavy loads, mud riding, or turning larger tires that require more low-end power.

How much wider does the Defender get with this portal gear lift installed?

This 4-inch portal gear lift increases width by approximately 4 inches per side, giving your Defender a wider, more stable stance. The added width improves control when running larger tires or navigating uneven terrain.

What makes SuperATV GDP portals stronger than other portal lifts?

GDP portals use precision-ground 9310 alloy steel gears and offer a dual idler configuration that spreads load across more surface area. This engineering delivers smoother operation and maximum strength under extreme torque, backed by years of real-world testing.

Do I need special wheels or backspacing for this portal gear lift?

Yes. Wheels must be at least 14 inches in diameter and cannot exceed 4.5 inches of backspacing. Following these requirements ensures proper clearance, correct steering geometry, and long-term reliability of the portal system.

Features

  • 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. diameter 4340 hardened steel drive shaft
  • Housings use advanced 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
  • Dual idler gear configuration adds a 3/4” front and rear offset—1.5” total extension
  • Lighter than the competition

Fitment

Kit 1 Will Fit:
  • Can-Am Defender HD 5 : 2017-2021
  • Can-Am Defender HD 5 DPS : 2017-2021
  • Can-Am Defender HD 8 : 2016-2021
  • Can-Am Defender HD 8 DPS : 2016-2021
  • Can-Am Defender HD 8 XT : 2016-2021
  • Can-Am Defender HD 10 : 2016-2019
  • Can-Am Defender HD 10 DPS : 2016-2021
  • Can-Am Defender HD 10 XT : 2016-2021
  • Can-Am Defender HD 10 XT Cab : 2016-2021
  • Can-Am Defender HD 10 XTP : 2018-2021
  • Can-Am Defender HD 10 Mossy Oak : 2018-2021
  • Can-Am Defender HD 10 PRO : 2020-2021
  • Can-Am Defender MAX HD 8 : 2017-2021
  • Can-Am Defender MAX HD 8 DPS : 2017-2021
  • Can-Am Defender MAX HD 8 XT : 2017-2021
  • Can-Am Defender MAX HD 10 : 2017-2021
  • Can-Am Defender MAX HD 10 DPS : 2017-2021
  • Can-Am Defender MAX HD 10 XT : 2017-2021
  • Can-Am Defender MAX HD 10 XT Cab : 2017

Kit 2 Will Fit:
  • Can-Am Defender HD 10 XMR : 2018-2021
  • Can-Am Defender HD 10 XT Cab : 2018-2021
  • Can-Am Defender Limited : 2020-2021
  • Can-Am Defender MAX HD 10 XT Cab : 2018-2021
  • Can-Am Defender MAX Lone Star Edition : 2018-2021
  • Can-Am Defender MAX HD 10 XMR : 2019-2021
  • Can-Am Defender MAX Limited : 2020-2021

Kit 3 Will Fit:
  • Can-Am Defender HD 9 : 2022+
  • Can-Am Defender HD 9 DPS : 2022+
  • Can-Am Defender HD 9 XT : 2022+
  • Can-Am Defender HD 9 DPS CAB : 2022+
  • Can-Am Defender HD 10 : 2022+
  • Can-Am Defender HD 10 DPS : 2022+
  • Can-Am Defender HD 10 XT : 2022+
  • Can-Am Defender HD 10 XT Cab : 2022+
  • Can-Am Defender HD 10 XTP : 2022+
  • Can-Am Defender HD 10 Mossy Oak : 2022+
  • Can-Am Defender HD 10 XMR : 2022+
  • Can-Am Defender Limited HD 10 : 2022+
  • Can-Am Defender Pro HD 10 : 2022+
  • Can-Am Defender MAX HD 9 : 2022+
  • Can-Am Defender MAX HD 9 DPS : 2022+
  • Can-Am Defender MAX HD 9 XT : 2022+
  • Can-Am Defender MAX HD 10 DPS : 2022+
  • Can-Am Defender MAX HD 10 XT : 2022+
  • Can-Am Defender MAX HD 10 XT Cab : 2022+
  • Can-Am Defender MAX HD 10 XMR : 2022+
  • Can-Am Defender MAX HD 10 Lone Star Edition : 2022+
  • Can-Am Defender MAX HD 10 Limited : 2022+

Wheel Requirements:
  • 14” or larger wheel required
  • Wheels cannot exceed 4-1/2” backspacing
  • Not compatible with dual beadlock wheels
  • Wheels need to have a center hole of at least 3.25" (82.55mm) or require a 1” wheel spacer

Manufacturer: SuperATV. Verify year and configuration before ordering.

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