I have a 69 GTO w/ TH400, and for some reason the crankshaft pilot bore measures 1.685 rather than the standard 1.703. As far as I know the crankshaft is stock, but I'm the 3rd owner so who knows what went on in the past. The smaller pilot bore size in the crank is making it impossible for me to replace the torque converter as none of them have a pilot hub small enough to fit. So far no machine shop is willing to try turning down the pilot hub the .0021 I need to clear it and I haven't had much luck finding anyone else with a similar issue. I appreciate any suggestions. Thanks!