4T40-E / 4T45-E GENERAL MOTORS FRONT WHEEL DRIVE
Cavalier, Malibu, Cutlass, Alero, Grand Am, Sunfire
Valve bodies are custom calibrated to provide firm, efficient shifts.
Modified pressure regulation system to furnish precise line pressure increase as needed with open throttle conditions.
Redesigned converter clutch apply circuit to yield greater holding capacity under high horsepower use.
New Solenoids installed
Modified pressure control solenoid installed (4T65E)
Additional Clutches Installed
Hi-Energy Friction Material Installed
Modified pump to increase volume and enhance fluid flow throughout the unit.
Heat treated pump driveshaft to prevent spline stripping
Heat treated apply sleeve to prevent breakage
Modified aftermarket front sun gear to prevent the pitting and galling often associated with the OEM part.
Heat treated final drive sun gear to prevent the metal fatigue associated with the OEM part.
New Torrington Bearing set installed to reduce frictional losses and prevent component failure
High strength drive chains utilized to prevent stretch and skipping teeth.
Limited Slip Differential available (optional)
4T40-E and 4T45-E: $2975
http://www.importperformancetrans.com/gmautofwd.shtml
This is one company but I don't think the one I posted above is the 600 hp one...i think they said it was good to around300-350hp.
Jimmy