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You have a AW4 transmission on your Cherokee and to be honest we don't see much wrong with them and are usually a very good transmission.. Has the shop checked for any codes in the TCM(Transmission Control Module)? How does the transmission fluid look, is it bright red or dark with a burnt smell? Is the transmission getting hot when it quits shifting?
Can the shop check the codes in the TCM and let me know what they find? Even if you remove the transmission relay it should still pull in default (3rd). Since it's not pulling at all then it's either overheating or the pump is failing. I'm intertested to see what codes are setting and if it's overheating or not..