When I am using the brake, I get a huge CLUNK in the back of the car during the 4-3 downshift. At firse I thought it was just from the bad accumulators, but then I realized it was to hard to be that. Could this be a symptom of the kind of wear in the first picture?

When i first bought the car and changed all the fluids the dif. fluid was a very dark blue with what looked like speckles of glitter when I jooked at it in the light. How much do these cost for an 85+ like you used and how difficult are they to install?