tranny hard shift

tranny shifts hard.does any one know who makes the repair kit for the 4l60 tranny for the valve body, and which valve causes the tranny to shift hard from 1-2 pluss shudder on take off.thanks

I have the same problem. Here are a couple of links that should help. You will need to buy the reamer ($100). Which one depends on whether the valve body is remanufactored or not. In the second link, scroll down to interactive reaming instructions.

http://www.transmissionspecialty.com/parts/PDF/77754-Combo(rb).pdf
http://www.transmissionspecialty.com/

You can buy parts here...
http://www.transmissioncenter.net/PinHole.htm

thanks for info havent tried it yet buy will let you know what happens