On my LBZ (drivers side) top of the radiator towards firewall there is an electrical box about 4 3/4 X 6" with wires coming out of the bottom. This box shell is alluminum with cooling prongs out the back and a plastic card with holes attached to the cooling prong side. The card looks like it could come off or should have been taken off (flimsy). What is it and should I discard the flimsy plastic card?

Got a picture?

The box is the TCM- Transmission Control Module

Don't know about the flimsy 'card' thing, probably so high tech thingamabob GM invented to keep the TCM .00001* cooler.

Mine doesn't have a card Here (http://www.dieselplace.com/forum/showthread.php?t=117681&highlight=TCM) is a pic of mine.