Main Shaft TY856 6MT 3.636 / 2.375 Ratio Stainless Steel Clutch Line This is a double cone

This is a double cone synchronizer with either 6 raised tabs to engage matching holes in the gear or 4 tabs depending on the application

All EJ models with single scroll turbo

EJ255/EJ257/EJ207 V10+/EJ20X/EJ20Y (DBW Throttle)

Two variations are available depending on the design of the bolt used to affix the left side inner timing cover to the tensioner bracket (they are interchangeable depending provided the correct bolt is used)

Legacy Spec B TY856 6MT

Main Shaft TY856 6MT 3.636 / 2.375 Ratio Stainless Steel Clutch Line This is a double coneMain shaft (aka input shaft) for 6 speed manual transmissions with trans ID codes starting with "TY856". This is for standard ratio applications such as MY04 06 USDM STI and JDM STI. Optional REM ISF (superfinishing) treatment. ISF is a precisely controlled treatment that reduces surface roughness left from the machining processes thereby improving reliability, reducing friction, and all but eliminating break in requirements and the resulting swarf.