What transmission do you have? If an auto you could use a 700 or 200 and if a standard you could use an old Borgwarner OD unit or a T-5. The first two would give you a 2.61 final and the T5 would give a 2.98 final. Just something to think about since it would keep the 3.73's for trailer pulling or heavy loads but give shallow gearing for highway cruising. This option is more pricey than a R&P swap, but a lot more versatile.
