sounds like a broken diff! but i did hear that the trans would most likely have a hole in it. you couldnt have messed up any gears if none of them go into gear. can you feel the car go into gear, or can you just move the shifter around anywhere you want? the selector shaft pin (bolt) could be gone. that would make it not have any gear feeling, you could put it in the first gear position, and move it all the way to the right to the 5th gear position and never hit the guides between the gears. you could possibly have actually stripped out the splines on a drive axle but the diff would go before the shaft would.
