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A 300zx speed sensor works in the RB25det transmission. I cannot remember off hand which one it is(turbo or non turbo). The 300zx speed sensor is used to help with the speedo problem from the s13-RB25 trans.
Gaz moose might be onto something. I would pull the speed sensor and inspect inside there and see if anything is off.
Some people have used an RB20 transmission on an Rb25. Maybe this is the case here?
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