at this point, its best to raise the car on a lift and use a big rod and check the ball joints and tie rods for wear, also check the rubber bushings, if they are worn - its about time to replace them all.
Drain the rust water cooling system and fill with proper coolant,
drain and replace the transmission oil.
replace the brake rubber pipes (they are a 6 to 8 year item anyway) and flush with new brake oil.
treat rust spots (if any) and drive it.