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?
Thanks
"Teknical" wrote
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...
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.
Lugnut
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