This is what I was able to find
For the 88
84-88 Cherokee & Wagoneer Mechanical & bodywork Service Manual by Jeep does not cover 4.0L six engine (86_59446)
84-88 6-cylinder engine service manual for 4.0L & 4.2L Jeep, AMC, & Eagle engine (86_8980010422)
86-88 Cherokee, Wagoneer, & Comanche AW-4 Transmission Manual by Jeep (86_AW4_Svc)
84-88 Transfercase Model 231 Overhaul Shop Service Repair Manual by Jeep for Cherokee, Wagoneer, & Comanchee (87_8980_010_378)
87-88 Cherokee Wagoneer Commanche Electrical Wiring manual by Jeep (cover may say 88 but covers both years) (875_8980010613)
Cherokee BOSCH Diesel Engine Fuel Injection System Shop Service Repair Manual by Jeep (85_CherokeeFIS)
Plus a few others
The 89
89 Jeep Shop Service Repair Manual by Jeep for Cherokee, Wrangler, and all other 1989 Jeep Models (89_81_370_9046)