Bent rear axle?

[Nilao]

Sleeve....if you have a spacer between the bearings then they are LMS hubs. LMS hubs get torqued to 300 ft-lb and left there. DO NOT back off a LMS hub.

from my meritor manual....

Models with a Double Nut Pack
WARNING
Tighten fasteners to the correct torque specifications. Do not
over-tighten or under-tighten fasteners, which can cause the
wheels to separate from the vehicle. Serious personal injury
and damage to components can result.
1. Install the inner spindle nut. Tighten it to 300 lb-ft (400 Nm).
Do not back off the spindle nut. Figure 5.7. @
Figure 5.7
2. Engage the spindle nut system locking device.
If the locking system cannot be engaged with the nut
tightened to 300 lb-ft (400 Nm): Advance the nut until
the nut locks.
If a double nut or jam nut system is used: Bend the lock
tab or install the set screw after the outer nut is tightened to
200 lb-ft (270 Nm). @
Rotate the hub when tightening.