Sumo Gear T-case idler gear suits Toyota 80/100 series HF2A

When installing an overdrive or underdrive gear set in a Toyota 80 or 100 Series transfer case, it's not uncommon for the original idler gear to interfere with the input gear or high-range gear. In some cases, the teeth of the factory idler gear can contact the root of the other gears, causing binding or improper gear engagement.

This modified idler gear adapts the internals of a 100 Series HF2A transfer case to 80 Series specifications, making it possible to install low and high-range reduction gears. It serves as a direct replacement for part number 36221-60140 in the 100 Series transfer case.

The solution is this upgraded Sumo Gear T-Case Idler Gear (Part No. 36221-60121-M). It features a reduced outside diameter to eliminate this interference, ensuring smooth, reliable operation when paired with aftermarket gear sets.

Specifications for idler gear

• Number of Teeth = 39

Made In Japan