I largely separate the Gen 3 (Chassis V60, NM/NP) into these groups:
01-02 XLS - 3.5L engine with 4spd transmission and manual transfer case, 4.9 Gears.
01-02 Limited - 3.5L engine with 5spd transmission and electronic transfer case, 4.3 Gears.
03+ (Limited) - 3.8L with 5spd transmission and...