I can't figure out what the clanking noise from rear underneath my Balzer

The steering wheel play could be a steering gear out of adjustment, worn tie rod ends, worn drag link ends, or even loose wheel bearings.

Make sure the shocks are both torqued properly, top and bottom. Leaf spring to axle housing bolts, leaf spring end bolts.

When does the clanking occur? Acceleration/deceleration? Normal operation/ steady state? Bumps?

Grasp the driveshaft and twist it back and forth. While twisting, make sure the differential yoke is moving in unison. Shake the driveshaft. There should be no play. If either fail, it's the u-joint. Perform the same test at the front of the driveshaft as well.