That is correct, no sleeve on the upper for the rears. You remove the nut and slide the old ones off of the mounting bolt, then slide new ones on. A little WD-40 helps. Trust me I spent about an hour under there last night. You'll want to get the upper on and get the nut started. To do job yourself id recommend having two jacks. I put my floor jack under the rear bumper and lifted the truck up a few inches so I had less distance to compress the shock. Then I compressed the shock (my shoulder hurts just thinking about this), got it started in the lower bracket, and pinned it in place with a bottle jack. Then used the bottle jack and some gentle whacks with a rubber mallet to get the hole aligned (stick a screwdriver in the hole or an alignment tool).