Joey,
As the other lists have noted, the cable should be checked,
But one point has been overlooked. The grease in the speedo
bearing has probable dried out and is causing the cable to
stick when it turns. It will eventually seize and stop the cable
when in turn seizes and strips the drive gear at the end of the
cable. Here's what to do.
a. Pull the Speedo.
b. Insert some sort of took into the drive hole and insure
that the tool spins easily by hand. If it is hard to turn
or stiff, you can try and free it with so drop oil. DROPS
not so much as to gum up the insides. If it still frozen
have the head rebuilt by Moma or Nissinger.
c. Everything at the head OK. Then jack the car up high
enough to get under the left rear. A lift is best. Using
a combination of long 3/8 extensions you can easily
use a socket to remove the nut holding the gear into
the trans. MKIA's seen to have holes in the frame that
are perfectly aligned for this. Pull the gear out and check
the teeth. Replace if required. Your Ford dealer should
carry these in stock. The stock tooth count is 15 but that
gear is no longer available. You'll have to go to 16 or 17
or etc. Each step up drops the speedo reading about
3 mph. Pull the cable out and apply a thin coat of grease,
reassemble,
Your speedo should now work. SS carries replacement speedo
cables with new insides.
The has been earlier discussions about calibrating the speedo
involving changing the gear inside the trans. Not easy. Do it the
cheap way. Drive down the interstate. Using a watch, adjust your
speed until you are passing the mile markers at the rate of 1 per
minute. Check you speedo reading. It should read 60 mph. It
probably read high. Change the speed gear. One tooth up means
3 mph down in the speedo. This is accurate for the tires and
wheels on the car. Change them and you'll be off again.
Have fun.
Dave
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