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Assembled by RalliSpec, the close ratio gears from the STi RA feature strengthened and hardened components for improved reliability of the 5MT in modified Imprezas. The gearsets have REM-treated 1st-4th gears for even further improvements in reliability at high power levels. Each gearset includes all necessary gears for installation including a custom speedometer gear (3.9 final drive ratio only). Please call for availability. Now REM Treated for increased strength. Professional installation is recommended. JDM STI 1st-3.166 2nd-1.882 3rd-1.296 4th-0.972 5th-0.738 JDM STI-RA 1st - 3.083 2nd - 2.062 3rd - 1.545 4th - 1.151 5th - 0.825 USDM WRX 1st - 3.454 2nd - 1.947 3rd - 1.366 4th - 0.972 5th - 0.738 This kit contains the following: STI RA Main Shaft STI RA 1st Driven Gear STI RA 2nd Driven Gear STI RA 3rd Drive Gear STI RA 4th Drive Gear STI RA 3rd/4th Driven Gear Cluster STI RA 5th Drive Gear STI RA 5th Driven Gear 1st Gear Synchro (baulk ring) Lock Nut, Main Shaft Lock Nut, Pinion Shaft Lock Nut, Driven Shaft Oil Seal, Main Shaft Custom Steel Speedometer Gear (Calibrated for 3.9 Final Drive) Case Gasket  You must select the correct Installation kit for the year of your car. If you are not sure what year your gear set it, you need the 02 WRX Install kit. If you do not have Flatirons Tuning build your transmission for you, we do not offer any warranty on the parts due to the number of issues that can occur due to improper installation. 2002 WRX Install Kit + RA Gear Set
2003 WRX RA Gear Set and Install Kit
2004 WRX RA Gear Set with Install Kit
05 - 07 WRX RA Gear Set with Install Kit
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