Many folks are swapping out their C4's for the AOD, AODE, or 4R70W overdrive transmissions. We sell the adapters and many parts and pieces to help with the swaps. With the regular AOD you will not need any controllers or electronics. With the AODE and 4R70W, a separate shift controller or electronics will be needed. Just something to consider. The setups do end up being longer overall, so driveshaft modification or replacement will most likely be needed.