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Old 12-06-2023, 10:01 AM   #4
pwdcougar
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Join Date: Oct 2013
Location: New Jersey
Posts: 1,332
Re: 99 front differential in a 97

The issue is that the 97 has a pigtail for the actuator and a pigtail for the 4wd engagement light. The 99 diff uses the mechanical actuator and has only one pigtail. Physically the differential bolts right up.

It took a few days of research and modifications to the wiring harness but I’ve got it sorted out.
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1969 Mercury Cougar Standard 4 speed
1969 Mercury Cougar XR7 convertible
1970 4WD Chevrolet Suburban
1997 4WD Chevrolet Silverado Extended Cab Short Bed (purchased new January 1997)
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