p 1837 1997 ford explorer repair info

1997 FORD EXPLORER
113,000 MILES
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POORMN
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The mechanic has run most every other test and the only one left is p1837.

What is involved with 1837? Thanks
Feb 13, 2012 at 7:30 PM
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FIXITMR
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There are 3 speed sensors mounted in the Transfer Case: the VSS to determine vehicle speed, and 2 driveshaft speed sensors which are used by the GEM to determine when to engage the TC clutch. The rear driveshaft speed sensor might be the one you should check/change.
Feb 13, 2012 at 8:12 PM