Our 700-R4/4L60E StreetFighter® transmissions include: No core charge/return, all gaskets and seals replaced with OEM parts, steels and friction elements replaced with new parts, forward clutch sprag replaced with new 29-element Borg Warner unit, low roller clutch replaced with new Borg Warner unit, largest OEM-sized intermediate servo assembly, higher mainline pressure from special TCI® pressure regulator spring & large diameter boost valve to increase torque capacity, TCI® Trans-Scat® kit for firmer shifts, transmission assembly statically tested for individual hydraulic circuit integrity before valve body installation, and each transmission is dyno tested to verify proper functions, pressures and cooler flow. Can replace an earlier 27-spline transmission when used with a new, 30-spline torque converter. Transmission is equipped with our 376600 universal torque converter clutch lock-up kit. Requires a TCI® TCU to operate the transmission and torque converter functions when used in pre-1993 applications.