Being 4th is direct drive, where input and output shafts are locked together, I would almost have to say it is in the bearings for the cluster shaft. I can't remember the technical name for the shaft...
1978 CJ5 5.0HO/T177/D300, '86 D30/D44 WT axles, 'glass body, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy
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