You could always upgrade to a Dana 70, housing is the same size as a 60 and you get a 10.5" ring gear and you can get gears from 3.55 to into the 7.17 gear ratio...stolen from Jantz engineering

Your Ring & Pinion is 33% stronger with no loss of ground clearance.

Dana rates the 60 @ 6000 Ft-lbs maximum momentary output torque. 35 spl HD.

Dana rates the 70 @ 8000 Ft-lbs maximum momentary output torque. Non HD.

That's a 2000 ft-lb increase in capacity.