On one of the fuel mileage posts, somebody suggested that the gentleman who started the thread should switch to 3.55 gears. Is this available anywhere - site? I ask because I have a dually with 4.10s. I was looking at doing a swap because most of my tow loads are under 5K, but the only gears I could find were 3.73s and 3.42s. The difference between 4.10 and 3.73 isn't enough to justify the cost and I worry about going to 3.42s with my truck because I don't want it to be a 'dog' when towing. The 3.55 or 3.6X may be a good compromise, but I haven't seen it offered anywhere. Anybody know of a site that offers an 'in-between' gear?