[Windsor]

Are you going to attempt the install yourself? You need the tools to set the pinion depth and a dial indicator to set the backlash. You can have your pinion bearning pressed off or you can purchase a new one. You probably should get an install kit with the shims need to properly set the ring and pinion. Ford uses these big cast iron shims to position the differential and it's unlikely the same shims will give you the necessary backlash. With the shim kit, you can get the adjustment, but you will need a thinner shim on one side (maybe both) to accomplish it. If you've never done this before, get prices for someone to do the install for you.