Is the 605 power steering box pitman arm a smaller diameter sized hole than the 800 box? The hole that goes onto the box itself. Is it so much smaller that the 800 pitman won't even come close to gripping the 605 box.
605 pitman arm is smaller where it mounts at the shaft on the box. It also has a 1/2" less drop than the 800 series pitman arm. You can buy one at speedway.