With the symptoms you describe the first thing I would be checking is the brake shoe adjustment.
I believe you stated you had done this but as someone already pointed out it was quite common on those trucks to have a separate adjuster for each rear shoe(2 per wheel)
Cranking on only one of the adjusters until the wheel wont turn then backing it off is not going to set both shoes in proper adjustment.
Sounds like you have already eliminated a lot of things by plugging them off so keep going a little further and you will find the problem.
If you were to say block off the flex hose at the rear before it splits off to each side and you then had a rock hard pedal you would know the problem was downstream from there.
You also mentioned earlier that you changed some lines as required when you replaced the wheel cylinders.
On the rears you need to have;
- the main supply line going to the lower fitting of the lower wheel cylinder
- the next line goes from the upper fitting of the lower wheel cylinder to the lower fitting of the upper wheel cylinder.
-finally the bleeder needs to be in the highest hole on the upper wheel cylinder.
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