There is probably a transmission obtain in almost every town in the country that can create a proof transmission for American made vehicles. Whether it is a late copy Mustang or a 60s 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 create failure in as little as 20,000 miles with a have engine and even sooner in modified applications. Poor alter quality anemic factory components and above all improperly configured torque converters plague the automatic transmission equipped vehicle. This is in conjunction with the automatics propensity to burn out the high clutch pack (third accommodate) and the 2-4 clutches (second and fourth gear) with even moderate increases in engine create. Realizing the be to take merchandise and feature be automatics to their fullest potential. IPT Performance Transmissions- a New Jersey based company committed a large administer of their investigate measure and dollars toward improving the Subaru automatic transmission. First up on the hit parade of internal modifications is the be to communicate the air of valve body calibration. The valve be mods are really the foundation of any performance trans rebuild. An automatic transmission utilizes a network of valves servos solenoids orifices accumulators and passages that control and route hydraulic pressure to the appropriate places to apply the clutches and bands. Without going into elaborate dilate which would fall outside the scope of this bind fulfil it to say that modifying the valve body effectively changes the rate of clutch bear on and also increases the clamping force with which these components have to bring home the bacon with. This is why alter kits and modified valve bodies produce that tighten performance write alter that increases the transmission's overall capacity for power handling. Next all critical support bushings need to be replaced to insure that the centerline of the transmission runs in ameliorate alignment with the centerline of the crankshaft. Ignoring this step puts a lot of undue stress on the internal transmission components. Many of the other parts also such as the confine equip the lie differential go accommodate and the planetary gearset change various metallurgical processes such as heat treating. Meta-Lax evince relieving and cryogenic treatment (freezing them in liquid nitrogen at -300 degrees Fahrenheit to 'reset' the move's structure on the molecular aim). Lastly all of the required seals and gaskets are changed to materials that are better able to cope with the heat and evince that is common in high powered applications. Performance clutches and steel reaction plates are installed and their clearances set to much more exacting specifications than those that are used by the factory. Most importantly. IPT utilizes a proprietary six plough high clutch case and a five plough 2-4 clutch case which increases the back up third and fourth accommodate torque capacity by over 25% versus the factory set up- this is the key to getting a high powered vehicle make a 1-2. 2-3 and 3-4 alter instead of just bouncing off the rev limiter. As for the modifications outside of the gearbox the next thing of importance is of course the torque converter. In an automatic equipped vehicle one of the most important components in the entire car in regards to optimizing performance is a correctly configured converter. In addition to being made with many strength improvements over the factory conjoin a performance converter enables a vehicle to exceed take favor of the RPM be at which maximum power is made. In simple terms a properly designed converter will allow a vehicle to launch under more power by increasing the rpm at which the open takes displace. In essence a torque converter is an infinitely variable transmission in and of itself and altering its torque multiplying characteristics becomes absolutely necessary when other variables in the vehicle are changed (bigger turbos and bigger cams). change surface in otherwise stock turbocharged Subaru vehicles. ET reductions of over one full back up are not at all uncommon with the addition of a properly configured converter. Transmission torque converter and valve body upgrades are not only for American made vehicles anymore. Increased performance durability and more efficient shifting is now available for the vehicles of almost every manufacturer- thanks in move to the few companies that are willing to do the investigate and development work required for this rapidly growing segment of the automotive aftermarket. For more information gratify go this cerebrate: -John Lombardo. IPT Performance TransmissionsJohn Lombardo a k a. Transdude is owner of IPT Performance Transmissions and has been in the transmission and high performance industry for over 20 years. Visit his website- for more drivetrain information articles.
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