Transgo Seperater plate [/align][hr]

I just bought a transgo hd2 for my 4l60e and i was wondering i think that i have seen people say that you need to buy a seperater plate. Should i buy one? Should i get this one? Shouldi get anything else (besides a stall) while im down their?

heres a link to the seperater plate
http://cgi.ebay.com/ebaymotors/4L60E...hippingPayment[/align]