Hijacking...
I have a similar issue with my 5.2/904...I bought and setup the lokar throttle and kickdown cables (very nice and clean install-would recommend to anyone) and it says adjust at WOT to no slack. I've done what's recommended, no kickdown at WOT...tried loosening up the adjustment thinking it had it too tight...early/soft shifts and "flaring" on the 2-3 shift...also seems to surge and bog the engine at stoplights when loosened up.
So, I snugged it back up to zero slack and it still won't downshift at WOT; pretty sure there's something I'm missing or doing incorrectly...any ideas?