I got mine directly from a transmission wholesaler.
check out www.transgo.com for a list of distributers.
The kit I got was part# SK®TFOD-Jr. I've installed a few during rebuilds with good results, but haven't done mine yet.

 

Cool. Keep me in mind when you do. I won't be able to get around to rebuilding my transmission until next spring, if then.

 

You can install it without rebuilding if you want.
Just remove the valve body and disassemble. The kit comes with pretty good instructions and pictures.
I'll let you know how mine ends up when I get it installed but working on my own truck isn't one of my fav things to do anymore.

 

Summit sells the trans-go kit for the 46re.

The instructions are a liitlehard to follow.They skip all over the page and the video is outdated to the point it confuses you; don't watch it.