6 gear Long Ratio 6MT Gear Kit - 2nd-6th Set

6 gear Long Ratio 6MT Gear Kit - 2nd-6th SetHIGH SPEED RATIOS Our long ratio set offers a matched set of replacement gears and main shaft for 2nd 6th gear. For USDM MY04 06 STI transmissions this provides improved 2nd 4th gear ratios making the car more suitable for drag racing, and higher speed road courses as well as general street performance driving. This also applies to all JDM STI models (or other international applications using the same ratios). For MY 07 21 USDM STI transmissions the

HIGH SPEED RATIOS

Our long ratio set offers a matched set of replacement gears and main shaft for 2nd-6th gear.  For USDM MY04-06 STI transmissions this provides improved 2nd-4th gear ratios making the car more suitable for drag racing, and higher speed road courses as well as general street performance driving.   This also applies to all JDM STI models (or other international applications using the same ratios).  For MY 07-21 USDM STI transmissions the 2nd-4th gear ratios will be unchanged (MY19-21 slight 3rd gear ratio difference).  The 5th and 6th gear ratios are the tallest ratios available and will reduce highway rpms as well as extend the usable speeds in those gears.  The 5th and 6th gear set can be purchased separately if desired.

All gears are REM ISF© treated.  ISF (isotropic superfinishing) is a treatment process that eliminates roughness and microscopic grooving created by the machining processes establishing a highly polished part with minimal dimensional change.  It is non-directional and strengthens the part by reducing or eliminating stress raisers on the surface that can initiate cracks and failures.  The lowered surface roughness has the benefits of reducing friction, lowering gearbox oil temperatures, and eliminating any need for running in the gears prior to fully loading them.

These are factory-based gears and even with the superfinishing process will not hold up to extreme power outputs.  We suggest a maximum of 600whp.

NOTE:  MY04-07 version includes MY07 2nd and 3rd gear synchronizers (required for proper fitment in MY04-06).   This set can be fitted to MY01-03 JDM, UK, or EDM models but requires updating 1st driven gear, 1st/2nd Sleeve & Hub, and 1st/2nd Shift Fork.  Contact us for MY01-03 details.

Gear Ratios (1st-6th):  OEM / 2.235 / 1.521 / 1.137 / 0.891 / 0.707

What it fits:

• STI MY04-21 (TY856 MT)