Same width? Thast kind of limits options. Strongest TTB (stock axle style) that came in a Ranger was a D35. It bolts right in palce of the D28 and there are upgrade options.
It's also possible to cut down the width a D44 or a solid axle with more work and expense.
For the rear a Ranger or Explorer 8.8 is a good option for a mostly bolt in option in about the stock width. Ranger axle up to 2008 will bolt right in. The FX4 LII is probably the pinnacle of stock ranger axles if you can find one, since all of them have a good locker and the only Ranger 31 spline axle from the factory. Explorer axle will require a bit more work, but all of them are 31 spline, they are more available, and many of them have disc brakes.
Most of this stuff is covered in the tech library if you want to look for more details.