Is the grinding from the front or the rear, and roughly how many km is it on? Also, is it a base Levante or an S, and is it GCC spec? That would help people point you to a shop that has actually done one.
Has the seller shared any service history or Carfax type report for the truck? That might tell you whether it's worth paying for a full inspection at all. Also, what's the mileage on it, and is it a 4x4? Transfer case concerns only apply if it is.
