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Message: [QUOTE="Highbeam, post: 231719, member: 23735"] It sounds like your looking at a gm product with the ratios specified. Most full size trucks come with a 3.73 rear end because it is a good compromise between mileage and power. The tow rating for this rear end is less than that for a 4.10 but by some small weight and do you really plan on hauling a monster trailer? My half ton truck is rated to tow 6500 lbs with a 3.73 "locking" rear end. Thats's plenty. If the "locker" is coming with the van from the factory then you don't need to worry about any of the side effects such as chirping tires. You will most likely never notice it until you get into some slick conditions. These "lockers" are a very soft locker and most have clutches which allow a small bit of slip to improve daily driveability. They do work and are worth the cost. I wouldn't own a 2 wheel drive without some sort of locking rear end. MPG is not affected by whether or not the rear end is a locker. Enjoy the van. [/QUOTE]