Transmission Pan gasket oil leak
My truckís transmission [F350 1999 7.3 Automatic trans] is leaking oil from the pan gasket. When I tried to tighten the bolts, I noticed that the aluminum thread on the transmission where the pan bolts go got stripped(most likely done by the dealer last time I got the oil and filter changed) checking all the bolts, I found 3 more bolts with the same problem. Now, I think I will have to make a new thread however, what size of drill, tap, and bolt I should buy as I understand all 3 should match to provide a good tightening. Or are there any other solutions where tapping to make new thread is not necessary? Also, what is the torque value for the transmission panís bolts?