Remove the driveshaft from the vehicle.
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On the rear axle, this is done by removing (4) 1/4" bolts and (2) steel retaining straps from the differential output yoke.
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At the transfer case, simply pull the driveshaft out of the slip yoke. Some oil may spill from the transfer case when the shaft is removed, but not a lot.
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The transfer case will look like this with the driveshaft removed.
