Aside from the legality of the max weight rating of the truck, I'm not sure you can get to 1 ton without risking breaking something on the frame. I think the frame would fail before the axle does, if you have an 8.8" axle. Keep in mind the max legal load rating for the Ranger, that I'm aware of is 1,250 pounds.
There are leaf springs out there rated for 1,750 pounds made for the Ranger. I don't know what options are out there for the front springs.
As far as the gearing, you will need to consider where you drive as to what gears you get and tire size will need to be matched in the gearing chart to see where you fall. You can go with a lower gear (numerically higher) if you do not drive on highways and Interstates. Also, gearing can only compensate so much for a smaller engine. So, 4.10 or 4.56 might work for you. Anything lower is probably going to be too much.
Speaking of tires, you are going to want to look into ones that can handle the load you end up working with. Otherwise you will end up with tire squirm and possible tire failure from being overloaded.
You might be able to get it done and done safely, but there is a lot of things to consider in order to make it work. To make it legal, you would want to look into if it is possible to get a GVR upgrade and how much it costs.
The only reason I mention the last part is that if you end up into some kind of accident, your insurance company may refuse to honor a claim if they find out you were carrying more than the truck is rated for. There may also be some kind of fine or legal issues if the police get involved.