I got 2 Chevys one a 96 2500 with 5.7 liter 1 ton rear-end with 373 gears n a HD trans n I have a 08 Chevy Silverado with 5.3 liter with 342 gears I avg 16-18 mpg I pull the same kinda trailer wit my 08....I am just wondering bout the 342 gears cause tis first time I heard of 342 gears...both my trucks r 2 wheel drive....just lookin for sum input n wat size iz a 5.3 liter?? All tis new terms for everythang has me lost...,lol