i just fought this fight....i had recently greased my slip joint then shortly after developed the klunk.i replaced calipers(i did have one hanging up)checked rear end...i was pulling my hair out.i was experiencing a klunk when brake pedal was released,applied,under acceleration....i even had a surge when shifting into park.because i had recently greased my slip joint i dismissed it....then at very last i pulled my driveshaft and the slip joint was frozen....i had to hammer it apart.apparently the grease i used(a thick syn wheel bearing grease)so i switched to a red ep(extreme pressure)grease and whoila!!!!!!!!!!!!no more klunk...........hope this helps
by the way my truck has 218k....my rearend is still good....
2002 f250 lariat 7.3 220k(motor has 190k)
original 4r100 tranny....220k and counting
knock on wood....
red elc good for 150k
4r100 1-2 2-3 3-4sonnax accumulator valves,.427 sonnax line pressure mod valve
4.125"yes thats 4 1/8" diy tymar intake(size matters...lol)
AIH delete,ccv delete,zoodad mod,
4" exhaust no muff
built my own leafs for 4.0 of lift!!!!!!
18" xd bronze revolvers with 325 nittos to wrap them
isspro pyro and boost guages on pillar mount....