I have had luck with large name additives. brought a completely gone tranny back...only driven about 1000 miles on her so time will tell. Changing the fluid is absolutely key...do it twice if you have the time. once you KNOW the fluid is clean and you are still slipping, then maybe start adding additives.

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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg