GM 4L60E/65E/70E (Electronic) Transmission Superior Powertow Shift Correction Kit This Shift Correction Kit from Superior will improve all 4L60E/65E/70E Transmissions from 1996-2005 From The Industry Trusted Fairbanks Line This Heavy duty Tow Package contains every possible item you would want to upgrade for towing. Includes the Critical Valves other kits don't come with It also contains all the updates to correct the 1870 check engine code High Performance PowerTow Selective Action Performance Packages are specifically designed and tested for hauling, fleet and commercial units. Designed "Programmer Friendly" * Firms shifts and increases holding power * Addresses code 1870 - includes TECKPAK/FITZALL USA "No-Ream" TCC valve repair kit * Includes the newly designed 1-2 Super Servo and "The Original" 3-4 Super Servo * Includes New separator plate (bonded w/ gaskets and 3 new accumulator pistons) Specifically developed for today's hard working computer controlled automatic transmissions. This Upgrade can be performed with the transmission still in the vehicle. This is the same kit that the Professional Transmission Re-builders use. Kit Includes Detailed Installation Instructions