gavin,
I just did this job this weekend and I wanted to post a quick thanks and a couple of lessons learned. Your photos and brief but thorough how-to really enabled me to tackle this. It took me about 14 hours total, working alone. Wasn't easy but oh so satisfying once complete.
-I followed your tip about leaving the pressure line, return line and steering shaft attached and it worked out great.
-I removed the radiator for clearance.
-I removed the passenger side inner tie rod before removing the rack, but I didn't have to raise my engine (1999 4.0 sohc 4x4).
-Once everything was disconnected, from the rack, I turned it to the left (driver's side) and pulled out the passenger's side first. This was the most difficult part of the whole job. Once I got the passenger's side out the driver's side slipped right out.
-When I re-installed the new rack (after transferring the lines and steering shaft over to it) I removed the driver's side inner tie rod, and slipped the passenger side inner tie rod in first, then threaded the lines and steering shaft up through engine bay and then I slid the driver side in. I bolted the rack in place and re-attached the driver side tie rod. The install went much for me easier than the extraction.
-Last thing I did was to disconnect the tie rod ends from the hubs, thread them onto the inner tie rods and reconnect the ends to the hubs.
-I meassured the ammount of visible threads on the on the tie rod before disassembly, and got as close as possible to that measurement when I put the ends back on. Even though my steering wheel was off a 1/4 turn to the right, this kept the alignment close enough for me to drive it to the shop for a real alignment. Steering wheel is back on center now.
Thanks again, hopes this helps anyone who decides to try it. BTW Pep Boys quoted me about $800 to do this job, I did it for about $200!