Drill bit & tap size for sye?

I aquired an extra np231 transfer case with a sye on it when I bought my xj. I was going to just swap transfer cases but the one I aquired has a 23 spline count input and mine has a 21 spline count.

So, I removed the sye from the spare TC and cut the shaft on my original. I have the hole drilled out to 5/16. I think it needs to be a bit bigger, but I do not want to drill any further until I find out what size the hole should be. Also, what size tap should be used? Does it matter? Can I just drill it to the size hole I want and tap it for any standard bolt? :dunno:

BTW, I searched and :read: for this info but it is like trying to find a needle in a hay stack.

swap main shafts from the transfer cases?

use the already tapped one?

no fear.
the hole is supposed to be 21/64th's ( 21/64 , for searching purposes)

Im sure you could drill bigger without any probs, just need a different tap other than what comes with REs kit. 21/64 is a bitch of a drill bit to find in stores.

21/64 is just a hair bigger than 5/16, but its enough material to remove so that the tapping goes smoothly.

hope that helps ya out a bit

21/64 drill size 3/8 x 24 tap size
Wayne

Thanks guys. I would swap the main shaft but who ever cut the main shaft on the spare TC cut it short and crooked. They also drilled and tapped the hole crooked.