i have changed the ps axle seal... because when i pulled the engine the axle sat against the seal, and i didnt want a $8 part become a major issue.
"Dark" had to help me because the axle "should" have come out of the hub, but mine was "like" welded in there. so he dropped the lower arm off to create some space, then we seperated it at the knuckle. Once the engine bracket was unbolted the ps axle slides right out. i would place a bag arounded the knuckle side where the boot is (grease), and a large drain pan under where the axle is coming out of the trans. i think i lost about
2 or maybe 3 qts.
There are 4 bolts that hold the seal in. remove them. pull the machined assembly out. throw some heat at it and work the seal out with a screw driver or whatever. do not damage the machined part by beating on it. clean the RTD of the back side. use a large rubber hammer and completely press in the seal...
take your time, hit it evenly until in gets sitted..then give it the business. MAKE SURE YOUR WORKING ON A BOARD or you could damage the machined part and it will never seal right. Clean it again with brake cleaner, apply RTD, let it set a little bit, clean the area where the machined part goes into (under car), put machined part w/ seal back in, bolt it down, put axle in, replace bolts on mount...finish the rest.
I dont know the DS

Cant image it would be too different.
When you drop all the trans fuild, it would probably be a good time to do that diff cover?
CMC
let me know if that made any sense, i eat paint chips