Hello Scuba Pete 1, I am not real sure which of the lower seals that you are referring to. But neither of them is real difficult. You only run into problems if you do something that is going to change the preload on one of the bearings or the worm gear or something else inside the gear box itself. I am sending you instructions from the GM service manual on how to replace the pitman shaft seal, if that is the one you are working on. If it is the O ring behind the round bottom cover that you are doing, it is pretty simple also. For that one, just look for a small round hole in the housing next to the round end plate cover. You are looking for a spot to insert a small pick tool so you can release the internal snap ring that holds the cover in place. If I can find a picture of that procedure, I will forward it later. But once, the snap ring, (more like a metal "O" ring) is removed from the cover, just turn the steering wheel a little and fluid pressure will push the end plate cover off. Then just replace the sealing "O" ring and reassemble. Just be sure to have a big catch pan under the gear box when the cover comes off as fluid will gush out. Instructions for the pitman shaft seal are below. If you have a problem or have another question or concern on the repair, just drop me a note and I will be happy to help you get this fixed. You will need a pitman arm removing tool, they are tight, maybe can rent from a parts store. The J4245 tool is just a regular pair of snap ring pliers and the J6219 is a regular seal installer. Thanks, Bob
J 4245 Internal Snap Ring Pliers
This is required in order to remove the seal.
If pitted, replace the shaft.
Remove the burrs before installing the new seals.
J 6219 Seal Installer
The seal should be in far enough in order to install the snap ring.
BELOW IS A PICTURE OF THE LOWER END COVER AND SNAP RING.
Number 3 is the seal.