Yeah, sounds like the tranny needs some DIY love. Please don't let the tranny scare you. Just keep it clean when you dig into it...use the right tools so you don't mess up the little bits and pieces. Its just a car part

With that level of slippage, you need to make sure your tranny fluid is clean (I know you just flushed it...drop some out and look at it in a glass jar...let it settle and check the bottom. It may be still dirty believe it or not.

Next step in my mind is going to find another car with a healthy trans. A rebuild can be expensive...and if you do one..it will take you ages...after about 3 or 4 you get the hang of it. But then you just open a tranny rebuild shop...so it doesn't make a lot of sense I had a long conversation with Roy about it and he was extremely helpful. You may want to just call him...he has forgotten more about this stuff then I will ever know.

Good luck.

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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