I have a 580 super E it slips in forward gear but
Was that the power shuttle that you broke down? If so, is it a Borg Warner velvet shuttle. I have a 580K and mine started slipping like that in forward and finally lost it completely. It had a strong reverse though.
I had to pull the power shuttle and replace the forward clutch disks. The stuff in the oil is probably the fibers from the friction disks. There are seven forwards disks and what happens in these shuttles is the Belville plate or washer breaks under stress and then wreaks havoc on the clutch disks.
What you are describing is exactly the way mine did. I put new forward dicks in and everything was fine then.
You said the disks looked new when you inspected them. You will see the reverse disks first and then as you go deeper into the shuttle you come to the forward disks. You may have been looking at the reverse plates.
My reverse plates also looked good but when I got to the forward plates they were burnt, scarred and very thin. Not much left of them. Check the forward disks, I bet that is where you will find your problem.
There are some pressure stall tests you can run to determine exactly what is not working properly.
Hope this helps and good luck.
Tim
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