That setup should have the 3.73 gears, but to verify check the rear diff. It will have the gear ratio listed.
A couple things that can help performance: full tune up, check for a blown plenum, inspect exhaust system for leaks, and/or clogged cat, look at and test O2 sensors.
I didnt have any issues towing a full 6x12 Uhaul from MN to TX, but things that will help you tow on a regular basis would be a weight distributing receiver, and trailer brakes.
1995 ZJ 5.2L V8 318. 220,000 miles and still rollin.
List of parts not replaced yet: