I have two 6l80s setup with a 2009 corvette OS/tune and setup for tap shifting. gears 1-5 work fine but the transmission won't go into 6th gear via tap shifting over 75mph. We have already adjusted the TU/TD table to not safety shift up or down until you hit a super high mph or a super low mph respectively to allow more complete manual control(off road race buggy not a car)

but is there some other safety shift table we can't access that is still locking out 6th gear from tap shifting at some point? certainly the normal shift tables allow for sixth gear at much higher speeds.

Thanks!