The 3rd gen steering box is NOT bolt in.
You need to get an adapter plate.
I got mine from Wild Horse Suspension. I think the website is
www.wildhorsesuspension.com, but I can't seem to get it to open for some reason.
It is actually pretty easy to do. You will need a puller to get the tie-rod off of the factory pitman arm.
It is actually very easy to do once you have everything in front of you. You cut one of the lines that returns to your power steering pump (different syle connector), remove the box, remove the steering shaft. Then reassemble with the new parts. Takes about 2 hours if you work at a moderate pace.
You will notice a huge difference with the 3rd gen box. One of the biggest improvements that I'm most happy about is the cold weather parking-lot manners of the pickup. With the factory second gen box, I was constantly "losing" power assist. I would have to CRANK on the wheel to turn the 35s. I've never had that problem since going to the 3rd gen box. I can 1 finger turn in and out of parking spots, and it never loses the assist. I also don't get that terrible cold weather second gen whine anymore.
The kit isn't cheap by any means.. But, it was entirely worth it for me.