I have a 62 push button I rebuilt. has a 67 front pump and clutch change
has shift kit and 3000 converter. Problem shifts 1-2 solid 2-3 over revs under light power. What is the problem driving crazy.
Checked governor and went thru. valve body. Any answers or guesses.

I would look at the shifter cable adjustment in the tranny, the early 727 with the cable shifters are real sensitive to that. I race several of them for a lot of years, I ended up taking the tranny pans off when adjusting the shifter cables, I would remove the C clip on the end of the male cable end that slides into the rooster comb arm and adjust the big wheel on the exterior cable until the end, pin, would slide, drop in with no forcing into the rooster comb arm hole in nuetral, 1st, 2nd and 3rd gear. If my memory serves me correct there is only one or two holes in the big wheel that will give you that adjustment, make sure and tighten the little retaining bolt into the case that holds the adjustment wheel still after each adjustment before checking the results of that adjustment I've seen the same symptons(SP?) on the later 727 with after market cable floor shifters, the pin has to drop into the hole in the tran shifter arm with no forcing on all the forward gears and neutral What is happening is the tranny valve body is not routing all the fluid to each gear properly, you can burn the tranny up with it not adjusted properly

Thanks I'll give that a try, you mean take the cable off under dash at push buttons?

No, there is no adjustments at the shifter under the dash. There is a threaded adjustment wheel with a bunch of different holes in it on the cable at the trans. where it goes into the valve body That is where you have to do the disconnect or adjust the shifter cable on those type tranny, lots of fun Drain and remove the tranny pan and look at the cable where it attaches to the valve body, take your time and get it right The cable slides into a metal sleeve with a spring retainer to hold the cable in, on the end of the sleeve is a small metal pin that goes into the rooster comb, that is the part that you want to drop into the rooster comb easily, very easily with no forcing Let us know your results, PM me if you want to also

I doubt the problem is related to shift cable adjustment but, if in doubt, push the Neutral button, remove the NSS (you'll lose some fluid if the car is level) and check the position of the internal metal tab (might need a mirror)....it should be dead center in the hole in Neutral.

RPM flareup on the 2-3 shift is usually an internal problem like a loose band/loose clutch clearances or pressure leakage but TP linkage adjustment might exacerbate the problem.

I had that problem in my Challenger (street car). 2-3 shift got later and later. Turned out the groove in the high gear piston was machined wrong causing it to leak. This was common on '80s transmissions from Chrysler. Takes a few years for it to wear enough to leak. If your trans has later parts this could be the cause. An air test should narrow it down.