Transmisson oil leak fix

[Plainsman30]

In order to reduce oil leaks, we installed new main shaft bearings (sealed on both sides) along with both the shaft seal kits. I don’t know how it worked as 55 miles later the clutch went out, so the motor is back out again.

Since he did my transmission, my mechanic had a problem on a similar job because of oil leaking out the front of the main drive gear bearing retainer. That customer was using light oil.

He said a cure would be to remove drive gear bearing retainer and plug a drain hole (in the case?) with a wooden dowel. The hole may be there to return the oil that originally went through the non- sealed bearings.

What are your opinions on plugging this hole? I will be using original type 600 oil.