Quick shifting trans

[6769charger]

I'm a new guy here, so pardon me if this has been brought up before, but I did not see it. I have recently got my 67 charger back together. It's a 318, mild build up. Trans was rebuilt by a guy who does Mopar trans. Trans set for about 1.5 years before it was installed. It seems to shift very fast and does not kickdown on acceleration. It has gone from 1st to  3rd before I am through an intersection. It does return to 1st when I come to a stop. Fluid is full on dip stick when checked warm and in neutral. I'm not sure where to start looking for my problem. Any ideas ??

[Musicman]

Who installed the tranny? Was the kickdown linkage adjusted? You might want to stop by the shop that rebuilt the tranny and see what's up.

[Plumcrazy]

Do you have the transmission throttle linkage hooked up and properly adjusted?
If not it will cause the transmission to upshift too soon.