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Just had the speedo sensor in the rear diff but that is long gone with the 8.25 rear diff.I now have a AC signal generator driven by the t-case to operate the speedo and the cruise still works.Do you have (or had) any wheel speed sensors on yours?
Being a '05 I'm pretty sure you have to have the cruise activated in the PCM/BCM for it to work.Not entirely sure on the gas KJ's but the CRD's you have to have the cruise turned on via a dealer scan tool.With the cruise servo connected, the jeep stalls when rolling to stop with the clutch pushed in. When I unplug the the electrical connector (leaving the cable and vacuum connected) the problem goes away. :Frustrated:
It seems like the idle is 100-200rpm less with the cruise plugged in.