Here's a list of OEM rear axle codes. You can find the code for your truck on your driver's door sticker.
19 = 3.55 open
H9 = 3.55 LSD
26 = 3.73 open
B6 = 3.73 LSD
27 = 3.31 open
18 = 3.08 open
25 = 4.10 open
B5 = 4.10 LSD
Peace! 
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