Ok, I swapped out my bad diff (3.27 non locking) with a 3.73 trac-loc. Car
is running perfectly now, except for the speedometer (of course). This car
has the digital dash board. How do I adust the speedometer? Does it still
use a speedometer gear, or is the digital dash board input different? If it
is a gear, does anyone have a calculator or chart to point me in the right
direction for the correct part?
If it's anything like other Fords, there's still a "conventional" drive gear on
the output shaft and a hole in the tailshaft housing, but instead of having a
cable screwed into the hole, an electronic module is installed.
In fact, here's the part listing for your car...
and a picture of your sensor...
All you need to do is find the appropriate gear to put on the shaft.
Call Ford, or a local tranny shop.
IIRC, you GM must have the PCM calibrated to compensate for
speedometer errors. I do not recall whether it can be
re-calibrated by the owner or if it has to be done with the
scan tool. Some vehicle can be re-calibrated with a key and
button pushing sequence described in the respective service
manual. I'm sorry I cannot take you any further.
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