EVO X Transfer Case Ring and Pinion gears! This fits your EVO X 5-speed, EVO X MR SST, and the SST Ralliart T-Case!

Made from Japanese 4320 Steel 
Forged / double tempered and super sub-zero treated for unsurpassed toughness 
Advanced shot peening technology increases surface hardness and advanced gear geometry designed using industry-leading software puts more power to the ground

Bearings and a Seal / O-Ring kit are optional, but highly recommended. Please note: You will need to reuse your small pinion bearing race / cup.



WPC is a permanent surface treatment that reduces friction while strengthening the part. Its unique micro-dimple formation pattern greatly reduces friction and is unmatched by conventional methods of surface treatment. It is a proven process that has been utilized for many years in the racing and automotive industry and is complimented by using our Micropolish treatment. WPC can strengthen parts in two ways. First it adds an extremely high level of compressive stress at, and near, the surface. The second, is that the WPC treatment creates a Nano - Crystalline structure at the surface of the metal. Both of these mean that metal fatigue and crack initiation are both noticeably reduced; thus strengthening the gear and shaft.



Micropolishing is a gentle polish on the gears done by machine that will smooth and remove some stress concentrations uniformly. It also polishes the gears in the area they make contact with other parts, so you have less friction loss which means less heat, better fuel economy, and longer life. This will not make your gears stronger, but with less friction there is less stress so you might see longer life from a gear after going through this process. 

Why the Micropolish process is important to any application:
  • Less inertia = Less friction = Less fuel consumed
  • Reduction of friction of metal to metal contact parts = Less wear and contact fatigue
  • Lower operating temperatures = Increased power output and efficiency
  • Increased power density = options of larger engines or smaller transmissions
  • Increased durability = Lower replacement costs and fewer failures
  • Additional Benefits:
  • Improved bending fatigue resistance
  • Reduced lubrication maintenance
  • Quieter operation
  • Reduces rotational torque
  • No metallurgical degradation
  • No geometrical degradation

Write a review

Please login or register to review

Ring and Pinion T-Case - EVO X / Ralliart

  • $1,050.00

Available Options

Tags: EVO Crown, EVO Parts, EVO T-Case, EVO X T-Case, EVO X Transfer Case, EVOX Ring Pinion

Contact Us

Whether you need a part to complete your build or want us to do it from the ground up, we've got you covered.
Let us take your project 'from Start to FINISH!'

Find Our Shop

Follow Us


3920 North Weber Street Colorado Springs, CO, 80907

Hours: Mon-Fri 8:30AM-7PM MT



Cookies Notice

We use essential cookies to make our site work, store your orders and searches, and make for a better user-experience. By clicking “Accept,“ you agree to our website's cookie use.