I'd get this looked at immediately, it's not the sort of thing that will go away. I'd start by checking fluid levels in the box.
There are many things that cause the flashing arrow, the mode switch, the remote transmission control (RTC) and the speedo sender on the differential.
By googling this I found a number of solutions to try-
This cleared the problem for a short term- with ignition off move the shift lever rapidly through its full range of motion.
Check all the connections on the three items listed above.
If your tranny isn't slipping, chances are it is something electrical. while each of these components aren't cheap, replacing one of them is way less than a rebuild on the tranny or a junnkyard replacement.
Check all the connections
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