Rolls forward in neutral, locks up rolling backwards??

Take the clutches out and post pics. And when you assemble it the first time, leave out the clutches, pump gasket, band, and pump o-ring and just check the endplay. Buy two of those little thrust buttons in case you want to double them up. And buy an extra front thrust washer; a thin one, in case you might want to add it to the pump washer.
Oddly enough, I was about to post a follow up that included pictures of the clutches.

I was giving the drum a final inspection before launch, and something caught my eye. I took it apart and found this.
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Without hesitation I packed up the drum and drove to the transmission shop to show him the pieces, so he could identify it. Turns out I broke the sealing ring....easy enough. But while we were shooting the ****, he was fiddling with the drum and noticed the clutches were loose. "Really ******* loose" is the technical jargon he used. I don't know, I'm not a transmission guy. Anyway, he popped them out and showed me how worn they were.
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These are from the direct drum. The forward drum clutches didn't look as worn, but the steels had burn marks that showed evidence the clutches had been slipping.
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Keith is a great guy and not out to nickel and dime people, so I trust him. He suggested replacing the clutches (obviously), but also suggested replacing the lip seals. After some back and forth talking about compressing the spring etc, I decided to pay him to build the drums. I think that was a smart move, especially after he said he'd set the clearance for the clutches. I had no idea I was supposed to do that...just thought you set the clutches in and let er rip. He also said he'd replace the wave snap ring with a flat snap ring, and that would give me a crisper shift.