Changing transmission fluid in a 3spd

[HigginsHorse]

I'm finally getting around to changing all of my fluids, but I don't see how to change the oil in my 3spd. I see what appears to be a fill hole in the top corner (although it might be tough to get fluid in it). Can someone tell me where to drain it, where to fill it and how I will know when it has enough oil in it. I have slow leaks in both diffs, the oil pan, tranny, and transfer case so I worried I may be running low.
Thanks for your help and any pics to help me find things would be appreciated.
HigginsHorse

 

[66halfdone]

You should have a drain plug toward the front of the case below
the front shift lever. It should be there,but maybe covered in crud.
If for some reason you do not find it there, you will need to purchase
a suction gun for removing and replacing the oil in your drivetrain. They
look like a caulking gun with a plastic hose attached. Any parts store should
carry them. Good luck

 

[66halfdone]

The fill plug is on the passenger side opposite the shift levers.
It it is not in the corner but smack in the center of the flat portion.
When filling, fill till it starts running back out and then its full.

 

[HigginsHorse]

Thanks for the pic. I now see where it should be, but its just a raised spot in the metal. No drain plug. Thanks for your help. No wonder I couldn't find it.