2003-2009 Toyota 4Runner Ring & Pinion Gears

Running oversized tires on a fourth-gen 4Runner kills fuel economy and bogs the engine in a way that's immediately noticeable on the highway. That's the problem that 2003-2009 Toyota 4Runner Ring & Pinion Gears are built to fix, bringing the final drive ratio back into alignment with the taller rolling diameter so the drivetrain doesn't feel like it's working against itself.

 

Ratio selection for a regear depends on tire size, the factory axle gear ratio, and how the truck is primarily driven, since highway builds and trail builds point toward different targets. The 4Runner uses different axle configurations front and rear on this generation, and matching the gear ratios on both ends is required to prevent binding through the transfer case.

 

A regear on the fourth-gen 4Runner usually happens as part of a broader drivetrain build, and 2003-2009 Toyota 4Runner Ring & Pinion Gears are one piece of that picture. Locker options for this generation that work alongside a gear ratio change are at 2003-2009 Toyota 4Runner Lockers, everything in the drivetrain category is at 2003-2009 Toyota 4Runner Drivetrain Parts, and the transmission and transfer case hardware that transfers power through these new ratios is at 2003-2009 Toyota 4Runner Transmission & Transfer Case Upgrades.