About the product.
Standard 1999 WRX TY754 transmission in it's normal state........................and with flipped differential
With standard ring & pinion the flipped gears don't mesh. With the reversed ring & pinion the gears mesh.
The Subaru 5 speed gearbox is a modern, lightweight, compact transaxle designed for a front engine car. Mostly used in WRX and Liberty sedans, this gearbox holds up to 206kw (280hp) in factory STi form. With a set of aftermarket gears these boxes will handle approx 500kw (650 hp). This makes them a great choice for high turbo race applications as well as everyday vehicles. The reversed ring and pinion allows all the gears in the transmission to rotate in the same direction as factory, ensuring long life and silent running as designed. Limited Slip Differentials (LSD's) of all kinds will work with the Subarugears reversed ring and pinion.
This product is compatible with all 4WD Subaru TY752, TY754, TY755, TY758 5 speed transmissions, produced from 1990 and still in production today. The serial number is on a sticker on the bellhousing. It is also compatible with all 4WD Subaru TY751 and 756 6 speed transmissions, produced from 2009 and still in production today. The 4WD transmissions are modified to become 2WD transmissions.
The bellhousing pattern is the same on EJ18, EJ20, EJ22, EJ25, EZ30, ER36, EG33. So they fit WRX, Impreza, Forester, Liberty, Legacy, Tribeca, Outback and SVX.
A basic Subaru transmission tour :
These transmissions suit the EJ, ER, EZ and EG series of engines, both in 4 bolt TY752 (1990 to 1998) and 8 bolt TY754/755/TY758 (1999 on). The transmissions and engines are all compatible with each other.
It is not possible to use this product with the Subaru FWD/2WD transmissions as the gears are different.
It is not possible to use this product with earlier EA style engines or transmissions as the bellhousing pattern is different.
This product IS NOT compatible with TY transmissions that have HI/LO range unless you lock the input shaft into direct drive and lose the HI/LO range. The split input shaft and gears in these transmissions interfere with the flipped ring and pinion gears.
This product IS NOT compatible with the larger STi 6 speed transmission TY85…..which is a different design to the TY75…. series.
This product IS NOT compatible with the Automatic transmission.