Took my 71 GS to the track last night and had no WOT 2-3 shift. The car has a untouched 69 PS code TH400 from a Pontiac 350 HO car that has been bulletproof with quick, drama-less shifts. It does not have a shift kit, and had likely never been opened. I did a search here, and a few other forums to see who's had luck correcting the issue and how, just need some feedback: Modulator and line - shifts fine at part throttle Kickdown switch - functions fine, has power. Do not hear solenoid click in pan, but I dont hear it on a known good car either. Governor - has known tune for 5300, and 1-2 shift is spot on So that leaves me with three possible things left? The detent solenoid sticking, 2-3 shift valve sticking, or an internal leak applying pressure to the clutches? The car exhibits no other issues, and will 2-3 shift as soon as I get out of WOT. This really pissed me off cause it was GREAT air last night, and my 1/8th miles would have put me deep into the 12's. Has anyone else had the same circumstances, and if so, how did you correct it?