727 Trouble...

I have a 79 W150 - 318 /727 All stock.. I started the truck and was driving out of the parking lot and the high idle was engaged so I put it in neutral and quickly floored it to knock off the high idle. Immediately after and ever since then the truck has no 2nd gear. It takes a LOOONNNGGG time to shift out of 1st and goes straight into 3rd gear. I have adjusted the kick down and the only difference is the amount of time it stays in first is shorter. Does it sound like I need a complete rebuild or????? TIA...