You might do a search...a guy here said he was selling an OD unit that was a lot cheaper than the GV. I have no connection with him, nor do I know if he makes a good product, but he was on here trying to find out some IDI info or maybe drum up some business too. The E40D is a nice unit, buit you really need at least the 97 and up upgrades and if possible a BTS tranny or other built E4OD. The C6 is pretty tough, you should consider keeping it if you want to stay auto, but its pretty inefficient too. It is cheap to overhaul. I had mine done at a flate rate shop...COMPLETE hard parts, soft parts, everything, for $900. Completely burned up...would have been around $3000 for an E4OD. A soft parts overhaul at a shop like that usually runs around $250 + the labor to remove and install. If you are at least semi skilled shadetree mechanic you might be able to do a soft parts overhaul on a C6 yourself for pretty cheap. It may not even be that bad of damage. I'd say it warrants pulling the pan for a look see before you panic...and checking the VRV and vaccum pump....accursed VRV....that's one more reason I want to go manual. Does it still slip if you shift it manually?