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It could have been converted to an A1 from a straight M939, but, if the data plate says it is an A1, I would bet it is. You still might not have the correct elbow gear.

Craig,your speedometer is off because the elbow gear attached the transfer case where the speedo cable attaches was designed to work with the 1100 X 20 tires. I would bet your truck was a straight M939 series and not an A1 and originally used these tires. You need to find the elbow gear that...