2002 dodge truck (1500) trans (any tech guys)

:read2:Hay all my check engine light is on again and I took it to the local auto parts store and they checked the code for my it came out as po736 rev. ratio incorrect I ask what would I need to do to fix this problem they looked on the puter and said a speed sensor that goes on the back axle would take care of this ...I's that right???I need to get this fixed it's time for the old obd check feb.thanks
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