Sounds to me like something is going haywire internally... worn part is partially engaging/disengaging at will...
BTW... niether my '92 XJ Laredo (4.0/AX15/NP231) nor my current '94 XJ Sport (4.0/AW4/NV242) had vacuum disco D30... my '93 Wrangler Renegade (4.0HO/AX15?NP231) didn't either... switch must have been befoer '92... FWIW
Improvise-Adapt-Overcome
'94 XJ Sport 4.0/AW4/NV242
'74 Ramcharger 360/TF727/NP203 (pt converted)
'00 Chocolate Lab female
'03 Black Lab female
'04 Black Rott'n'Lab male
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