When stopping, just before completely stopping, I feel a shudder in rear ende

Have you check U-joints? Crawl under and yank on drive shaft. If there's "slop" there junk. It's a place to start checking...

You might also look into the spindle bushings. The spindle is the part of the suspension that the axle will go into. I had another vehicle that did the same thing and we had to replace the spindle. You might be able to just replace the bushings depending on the set-up. Best thing to do is call your local parts store and get pricing on the bushings. They may tell you that you have to replace the spindle to do the bushings.

Hi!! This is not an answer for you but I seem to be feeling the same problem with my '99 IA. Just recently, I feel this jolt from the back when stepping on the brakes specially when it's raining heavily.... May I ask you what was the diagnosis on your vehicle so I may be able to relate it to mine? Thank you.