Why is it a 3.55 gear can tow 10,000#'s or 8,800#'s?
How do I really know what RAM I'm looking at can tow?
The tow rating of a truck depends on engine, transmission, axle ratio, cab/bed configuration, and whether it's 4x4 or 4x2.
Larger cab/bed configurations and 4x4 add weight which reduces towing capacity.
More powerful engines, more gears in the transmission, and lower (numerically higher) axle ratios raise towing capacity.
So if two trucks have 3.55 axle ratios, and one is rated to tow 8800 and the other is rated to tow 10000, that means something else is different. 6-speed vs. 4-speed transmission maybe? Higher output Hemi? Regular cab 4x2 vs. crew cab 4x4?
The owner's manual will give you the tow ratings. All you need to do is find the towing section and look up the truck's cab/bed/drive/axle ratio combination in the tables.