I6 --> D30 in front and standard is D35 in rear with 3.55 gears
1) 3.73 gears with trailer tow group or package
2) Vari-Lok (LSD) rear and comes with a D44a differential
The previously optional Trac-Lok (LSD) was not available in 2002. Your Laredo with Selec-Trac probably came with the standard I6 equipment
BTW, it's a Limited or a Laredo but not both.
2001 WJ Limited with Quadra-Drive, Kenne Bell Supercharger, 3-inch Kolak exhaust, Stillen rotors (F/R) and MM pads, Addco sway bars (F/R).