The 4t45e transmission is the weak link in getting the most out of your N-body's powertrain. The 4t65eHD is a much stronger unit. This kit comes with everything you need to install a 4t65eHD transmission into your late model N-body vehicle. The 4t65eHD is used in the Supercharged 3800 GM vehicles and other high-output fwd vehicles. The gear ratio of the 4t65eHD is 2.93, so we convert it to 3.29 so it matches a Grand Am GT's factory ratio.
Kit includes: -rebuilt 3.29 geared 4t65eHD transmission with hardened 4th clutch shaft and a shift kit installed -4t65e transmission mounts with polyurethane bushings, powdercoated the color of your choice -custom axles -AN -6 transmission lines -plug and play transmission wiring adapter kit -MMS PCM written for the new transmission, including performance tuning