Gari,
The pins are about 1/4" at the big end - a 3/16" drift should work fine.
You should be able to remove the housing without removing the pins. Easier to reinstall the housing with the pins out of the way (don't scuff up the gasket).
Oh yeah, don't go cheap and try to just fit a NAPA gasket - you'll never get the thicknesses to match. Buy the Moyer oil pan gasket and just cut off the part for the transmission. Cut it long the first time, then trim it to get the bolt holes to line up. A bit of brown Permatex (in the tube, not the bottle stuff) will fill any gaps. As someone said, it's only splash - no pressure.
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