At the moment, we are working with Drew Tech on a firmware update. I would guess that Matt will be waiting until this update is complete before we release the custom tuning from River City Diesel. That makes the most sense to me anyway. I do not have an estimated release date for the new firmware. I hope that it's ready to go before the end of the year though. I believe that tire size adjustment will be available. I also think there will be something available in relation to gear ratio. I don't know if this is transmission tuning related though. I would think it would have a direct relation to transmission tuning (torque converter lock-up mainly), so we shall see. There are a few other things, but I don't know enough about it to say for sure. When I get more information I will let you guys know.
Thanks,
Jeff@Spartan