no third gear

I have a 66 barracuda, with a slant six and unknown automatic transmission.

I removed my carb to rebuild it this week end, when I re-assembled everything, I have been having trouble with my transmission. I asume it is something to do with the Throttle Pressure(Kickdown) linkage. My car will not engage Third (Drive) no matter what the throttle pressure. I have a type II (69-73)throttle linkage according to my trusty haynes manual. I did drive the car for about 5 miles, before I realized that I had forgotten to re-attach the spring that is holding the slotted rod (sort of "J" shaped) I have since re-attached the spring, but I still have no Third gear.

I am hoping that something just needs to be adjusted after taking all this linkage apart to remove the Carb.

Before the carb work, I did find that I had to let off the gas a bit sometimes to get the car to shift from second to drive. Now when I do so it feels like the tranny is kind of in between second and drive perhaps slipping?