I don't know that this is your best solution at this point. You really need to inspect your pinion to verify any damage done when pushing the car around. Basically you were in effect stripping one of the gears to get the car to movbe with unequal tooth count pieces. My guess is that you should probably look into replacing the entire pinion/FD assembly with either the zetec as you originally wanted or the stock 4.06 ratio and not reuse an abused part in your formula. Do you really want to invest the time and effort into tearing down the car again if you break something in the trans because you didn't replace it?
Speaking as someone who has pulled and reinstalled engines numerous times in a forced induction contour, I surely wouldn't want that. My time is worth a lot more than the couple hundred the new parts will cost. Take it as an expensive lesson learned and go for it the right way this time.
Rick
