I saw on the Powertrain Control Solutions website that they offer an aftermarket valve body that turns a 4L80 truck transmission into a 5/6-speed automatic, by engaging the overdrive solenoids. What I'd like to know is: has anyone done the same for the FWD gearboxes as well? The PCS rep I talked to hasn't heard of anything... but he did also say that they generally develop computer systems, not the oily bits! And can the gearsets in the 4T65 be modified, for that matter?