You'll need to adjust the position of the cage & roller for the rear just like you did for the front. The seat adjuster must be able to move between the two stop positions as shown in the first image below. You can move the cage and roller forward a bit by gently tapping on the tool you made with your small hammer. Position your tool on the roller and not the cage. And don't push it too far forward. Move the two pieces back and forth from time to time to gauge whether you need to adjust any further. It is easier to push the cage in than it is to move it backward, obviously. When you've finished and have everything as you need it to be, use a screwdriver tip or bamboo skewer to push some wheel bearing grease anywhere the roller or bearings will travel. Work your adjuster back and forth and you should see it gets much easier to move now that it is lubricated. Wipe off any excess grease with a rag and some mineral spirits and your adjuster is ready to go and work like it should. Hope this is helpful.
~ Jon 1952 1/2 ton with 1959 235 | T5 with 3.07 rear end