I just did this a week ago. I am talking about an NP242 from an 89. I put a jack under the transmission and lowered the whole assembly a little. Disco the linkage before you do this, but momorize how it looks in your head, or it could be a pain later on. The top drivers side nut I removed with an extension and a flex-nuckle on the socket. I attacked this one from the top. The one on the side came off with a box end wrench with the a ratcheting head. I think mine are Crescent brand, but there are a lot of them out, now. I plan to buy a whole set of them, because they are a huge help. Once the case and tranny is angled down, you will have better access to the hole. Be ready, cause that mother weighs about 70lbs. Not much room to get the f out of the way, incase your grip slips. What are you doing to your case?