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Aluminum transmission extension housing
Forester STI MY04-07
AP3-SUB-003 (MY08-14 WRX & STI / MY07+ EJ255 Legacy/Outback/Forester)
Crafted from hard anodized billet aluminum and incorporating urethane bushings
WRX EJ255 MY06-07/MY12-14
3rd Drive Gear TY856 6MT Ratio 1.591 REM ISF:No Aluminum transmission extension housing3rd drive gear for 6 speed manual transmissions with trans ID codes starting with "TY856". This is one of the two taller (longer) 3rd gear ratios used by Subaru and is for USDM STI MY19 21 (and MY18 RA). Also used in some European market applications. 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
