I still dont see the need to switch PCMs when swithing manual trannies from a five speed to a 6 speed. Case in point: My brother owner of a 1995 Mustang Cobra 5.0 switch from the stock T-5, to a Dodge Viper six speed with no modification to the PCM, the PCM doesn't know what gear your in, it only knows load, RPM, and Speed(yes, I know it monitors tons more than that, but I'm breakin' it down kindergarten style here), it doesn't give a crap about gear ratio(which is all you are doing by adding a 6th gear: redistributing the gear ratios).
