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try this then,ther is a small tube above the Trans,I think Passenger side.it is for Venting.it looks like,well a Small tube,haha,with a little Cap.this cap is supposed to be Loose an allow venting of the transmission,,see if you can get at it and move,twist the Top little cap(don't pull it off!),If you Can't ,then the trans is building pressure and Putting Gear Oil(transmission Fluid) through to atmosphere,which in your case is the speedo cable.!
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