subaru performance automatic transmission
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Subaru motor vehicles have used manual, conventional automatic, and continuously variable (CVT) transmissions. Subaru manufactures its own manual and CVT transmissions (for non-Kei cars). Since the 2014 model year, the conventional automatic transmissions in North American-spec Subaru vehicles have been replaced with Lineartronic CVTs (with one exception as the BRZ).
Subaru uses two types of traction delivery systems, called Active Torque Split (ACT), or the performance oriented Variable Torque Distribution, called VTD. ACT drives the front wheels directly and the rear wheels through a hydraulic clutch. The control unit monitors several factors including vehicle speed, gear position, and wheel speed and then varies the application of the clutch based on a model stored in memory. The effect is a constantly and actively changing torque to the rear wheels anywhere from a few percent to fully locked. The control unit can and does alter torque several times per second. Vehicles with higher power engines use a more aggressive model resulting in generally higher rear engagement. Later attempts at reducing customer confusion resulted in torque split numbers being given, but these have no meaning as there is no mechanical or other device to provide a static starting point for the control unit. This system is the more commonly used setup used on most Subaru products after its introduction on the XT6.
VTD adds a twin planetary center differential to the clutch and therefore has a static, starting torque split calculated on the planetary gear ratio, with the most common being 45:55. The active clutch operation is similar to the ACT system, although the clutch is used to suppress differential action instead of as the differential itself. VTD was introduced on the Alcyone SVX in 1991 and is usually found in performance models equipped with a turbocharger, along with the VDC outback and USDM 2003-2004 Legacy GT/2.5GT.
ACT and VTD are found in both generations of the 4 speed while the 5 speed uses only VTD.
This transmission was released in 1988 for use in the Subaru XT6 and Leone Touring Wagon. The bellhousing and input shaft were changed for the Subaru EJ engine, the first was used until about 1998, when a major redesign of the holding devices was released. The second generation saw use until 2008.
The Ford Motor Company also uses a transmission on some Ford, Kia Motors, Mercury, and Mazda products called the F-4EAT, which shares some similarities with the Subaru, since they are both manufactured by Jatco.[citation needed] The Nissan Pathfinder has also used this transmission in the past with an external transfer case attached.
The final use of the 3.272 final drive ratio (Part 38100AB740) was in the 2009 Legacy 3.0R Limited sedan (but not the regular R sedan), the 2009 Outback 2.5XT Limited (but not the regular XT), and the 2009 Outback 3.0R Limited (but not the regular R or LL Bean).
There is probably a transmission shop in almost every town in the country that can build a bulletproof transmission for American made vehicles. Whether it is a late model Mustang or a 60's Chevelle, there are lots of aftermarket components and many years of technology available for the transmission rebuilder to utilize.
The same cannot be said for the 4EAT automatic transmissions found in Subaru vehicles. In factory form, these transmissions demonstrate several problem areas that can cause failure in as little as 20,000 miles with a stock engine and even sooner in modified applications.
Poor shift quality, anemic factory components, and above all, improperly configured torque converters plague the automatic transmission equipped vehicle. This is in conjunction with the automatic's propensity to burn out the high clutch pack (third gear) and the 2-4 clutches (second and fourth gear) with even moderate increases in engine output.
Realizing the need to take import and sport compact automatics to their fullest potential, IPT Performance Transmissions- a New Jersey based company, committed a large portion of their research time and dollars toward improving the Subaru automatic transmission.
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