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Drivetrain› Differentials and Rear-End Components

MFactory

Close Ratio Gear Set

Name: Close Ratio Gear Set
Brand: MFactory
SKU: MF-TRS-01WRX

$2,624.95 $2,433.37 Save $191.58

SKU: MF-TRS-01WRX

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Overview

These gears are diamond cut to exacting tolerances from forged high-nickel-chromium-molybdenum steel. They are engineered using Solidworks 3D CAD and Cosmos FEA software to minimize parasitic drivetrain losses.

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The MFactory Close Ratio Gears for your Subaru WRX 5-speed provide a significant boost in acceleration, sacrificing top-end speed to maximize power delivery across the rev range. These gear sets are manufactured from high-nickel-chromium-molybdenum steel, chosen for its durability and performance characteristics under stress. Each gear is produced using precise Diamond Cut manufacturing techniques and subjected to double tempering and super sub-zero treatment to ensure maximum material toughness. Designed for integration with the Subaru WRX 5-speed manual transmission, these components ensure robust reliability for performance driving applications. The use of leading-edge Solidworks 3D CAD and Cosmos FEA software ensures that every gear set meets exacting tolerances for a reliable fit and long-term durability within the factory transmission housing.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

Brand	MFactory
Part Number	MF-TRS-01WRX
Category	Drivetrain

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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