The oil pan had to be switched over to a rear sump to make room for the high crossover steering.
**I forgot initially to mention a very important potential problem. The dipstick! I was lucky enough that the 1999 4runner had a plug in the block that can be knocked out to install the rear sump dipstick tube. Later model do require drilling out the block (at an angle from the bottom) for the dipstick tube. This is why Trail Gear just has you cut the dipstick down and add an extra quart of oil. I did this on my front original dip stick and left it where it was but I did install the rear sump dipstick also. The second problem I ran into is that my motor mount didn't have the hole for the tube (some models do, my friends Tacoma had the hole in the motor mount) but we had to pull off the motor mount and drill a large hole in it for the dipstick to go through. Not a huge problem but did take a couple of hours to complete.
I don't have any pictures of this but the drivers motor mount had to be removed and drilled out to make room for the new dipstick. There was also a plug that was knocked out of the bottom of the motor for the dipstick tube.
This was by far the scariest part of the install. Huge pieces had to be cut out of the frame behind the motor to make room for the frenched shackles. If we screwed up here it would be very hard to repair. I'm sure Sky Manufacturing has a jig they use when they are SASing trucks but we didn't have anything like that. To make it even more complicated the frame is angled in here so you are cutting this piece out at an angle.