Apparently it seems that axle is slipping from gear box end .. the splines get weak and a play develops ..
vibration can also be due to
- engine foundation
- bent tires
- wheel bearing
- Wheels / rims
- bushes
for fuel average CAT is a must
for power steering, it could be
- air in fluid .. bleeding is required
- some broken linkage
- play in rack and pinion system
- a leak in hydraulic system
- weak pump