[esbstuff]

Quoted from car-part.com..."

ch cab (opt ZW9), w/o wide track; 6 spd MT (opt ML6), 3.73 ratio (opt GT4)
ch cab (opt ZW9), w/o wide track; 6 spd MT (opt ML6), 4.10 ratio (opt GT5)
ch cab (opt ZW9), w/o wide track; w/o 6 spd MT; 3.73 ratio (opt GT4)
ch cab (opt ZW9), w/o wide track; w/o 6 spd MT; 4.10 ratio (opt GT5)
ch cab (opt ZW9), wide track (opt GTY), 6 spd MT (opt ML6), 3.73 ratio (opt GT4)
ch cab (opt ZW9), wide track (opt GTY), 6 spd MT (opt ML6), 4.10 ratio (opt GT5)
ch cab (opt ZW9), wide track (opt GTY), w/o 6 spd MT; 3.73 ratio (opt GT4)
ch cab (opt ZW9), wide track (opt GTY), w/o 6 spd MT; 4.10 ratio (opt GT5)
exc. ch cab; brake opt JH7, 6 spd MT (opt ML6), 3.73 ratio (opt GT4)
exc. ch cab; brake opt JH7, 6 spd MT (opt ML6), 4.10 ratio (opt GT5)
exc. ch cab; brake opt JH7, w/o 6 spd MT; 3.73 ratio (opt GT4)
exc. ch cab; brake opt JH7, w/o 6 spd MT; 4.10 ratio (opt GT5)
exc. ch cab; brake opt JH6, 3.73 ratio (opt GT4)
exc. ch cab; brake opt JH6, 4.10 ratio (opt GT5) "

This is just 2006...