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Registered
Join Date: Aug 2002
Location: Galivants Ferry, SC
Posts: 10,550
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It's probably the magnetic sending unit that attaches to the outside of the transmission case...held on by a small clip. If I recall correctly, it does not penetrate the trans case but simply gets inductive pulses from inside ( via magnets).
Replace the sending unit...I have the same issue on my 85 ( 915 trans) that uses a similar arrangement. No speed indication until 20 mph and then it jumps up tp 20 mph+ and continues normally. I have the part but haven't yet installed it.
-- Wil
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Wil Ferch
85 Carrera ( gone, but not forgotten )
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