The 4Wheel Parts guy is clueless, he's not paying attention to what transmission you have. 4.88 would be great for 33" tires with the 4-speed automatic used in 2003 and newer TJs but not your 3-speed automatic used in 2002 and older TJs.
For 33" tires, go with 4.10. For 35" tires, go with 4.56. Your highway rpms would be excessive with 4.56 and 33" tires.