It would help if you knew the tooth count on the speedo drive gear inside the trans. I don't know if there is a standard or if there are variations. I have not had the pleasure of working this problem on my 4-speed yet. For the turbo400 auto there is a 15 or 17 tooth gear on the tail shaft, with the autos it depended on the gearing in the rear end which was installed in the trans. do you know if the speedo was fast or slow???
|