4L60E Transmission Rebuild Kit Heavy Duty Master Kit with 3-4 Power-pack World Wide Parts Outlet is the ONLY ALTO authorized distributor of this custom kit. For Rebuilds of 1997-2003 GM 4L60E transmissions. All HEG Frictions NOT Stock Tan materiel "True Heavy Duty Plates" Includes The Alto 3-4 Power Pack "increases the stock 3-4 clutch stack" to 30% greater holding capacity & durability. For Deep pan Units Only "If you have shallow pan filter or Corvette Pan filter will not be correct"