Before taking a long trip to Gwadar, why not take a trip to some other location first? Like go to Hyderabad or even Lahore? That way you will gain some confidence in your car and if anything goes wrong you will know its limitation. And I think mechanics and spare parts are generally available along the route to Hyderabad or onwards till Lahore.
As an assurance before leaving on such a trip change all belts and fluids, get all moving parts checked and then leave! 