Brakes are new and howling

Any input.

1992 truck, stud pilot ball seat wheels.

4709ES marathon brake shoes, new not re-lines with proper camshafts.

Balance cast import 3600x style drums. I’ve been running this number drums for 20 years on stud pilots

Just put new brakes, new drums, new hardware, new wheel seals.

The brakes are howling and squealing at low speeds. Sometimes I get a brake chatter I can’t explain like the shoes are jumping inside the drums. I did remove the wheels today and made sure everything was tight with the wheels cause I torqued them when I installed them to 380lb ft as suggest for ball seat wheels. Today I didn’t torque them I tighten them with the impact.

What else could make these howl? I’m wondering is the import drums are the issue. Marathon lining is a pretty good quality lining.

 

they’re tight all of them. I had all 4 cams out to replace the grease seals on them. Reinstalled no issues there.

 

I didn’t torque them the second time but I did tighten them further with the impact. I never had luck torquing barrel nuts in the past but thought I’d try it again and now I have noisy brakes.