Sqeaking can be fixed by cleaning the leaves and applying either graphite paint or brushing grease between the leaves or adding/replacing any worn out anti-friction pads.
Sitting on the overload will make for a rougher ride, only way to fix that is get the leaves up off the overload, re-arching, an add-a-leaf, or helper springs, or new spring pack would help, but raise the rear end higher most likely.
Normally the overload leaf helps w/ axle wrap, with the rear spring clamp. However, that clamp is set up above the main leaf and when the springs settle, it takes quite a bit of wrap befor that clamp makes contact with the rest of the pack and limits the wrap. Adding and anti-wrap leaf or a traction bar can help with axle wrap.
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