SuperATV Portal Gear Lifts — Lift, Torque, & Bulletproof Strength

A portal gear lift replaces your factory hub with a sealed gearbox at each wheel. Three gears inside — drive, idler, and driven — lower the wheel below the hub centerline, giving you 4″, 6″, or 8″ of clearance without raising your chassis. The same gearbox geometry creates a gear reduction that multiplies torque at the wheel, restoring the bottom end you lose when you fit bigger tires.

The idler gear inside a portal box contacts two other gears at once, so it eats the most load — and it's the most common point of failure under heavy throttle or rock-crawling abuse. SuperATV's dual idler boxes add a second idler gear so the load is shared across nearly twice the surface area.

You need it if you're rock crawling, running 35″+ tires, or have a heavy throttle finger. For everyday trail or work-truck use on 32″ tires, single idler is plenty.

Match the reduction to your tire size: 32 to 33″ tires run well on 15% or 30%, 35″ tires want 30% as the industry standard, and 37″ or 40″ tires want 45% or higher to protect your factory axles and transmission. SuperATV publishes a portal calculator on their site that takes your stock tire size, target tire size, and stock top speed and tells you the reduction that keeps your top speed where you want it.

No — that's the whole point. Because the lift happens at the hub, your axles, A-arms, and shocks all stay at the geometry the manufacturer designed. That's the biggest reason a portal gear lift is gentler on your driveline than a comparable big-lift suspension kit, where every inch of lift adds CV-joint angle.

You don't have to, but most riders do — and we'd recommend it. The combination of bigger tires plus added rotational mass plus a heavier-throttle riding style stresses the OE axles. SuperATV's Rhino 2.0 heavy-duty axles use stronger CV joints and rebuildable boots, and they're a direct drop-in for the platforms covered above. You'll see them in the Companion section earlier on this page.

The kit ships with portal housings, internal gears, brake-line extensions, and the hardware to bolt it all up. The two extras you need are a bottle of SuperATV Portal Blood gear oil (about 32 oz fills four 4″ portals) and an extra bottle of brake fluid for the line bleed. Riders running 30%+ reduction often add a clutch kit afterward to recover the top speed that the gear reduction trades away.

That depends on your reduction percentage and your tire size. 15% reduction with a tire close to stock size barely moves the needle. 30% reduction with stock tires takes a real bite out of top speed — and that's why most riders running 30%+ pair the portal install with a 35″ tire upgrade and a clutch kit. The bigger tire compensates mechanically for the reduction, and the clutch tune restores the responsiveness you'd otherwise lose.

A capable home mechanic with a torque wrench, a good jack, and a few hours of patience can install a 4″ GDP portal kit in a weekend. The longest part is bleeding brakes after the line extensions go on. Shops typically charge between 6 and 10 hours of labor depending on the platform and whether they're swapping axles at the same time.