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hopefully you still have the TCM.

NOTE is from OEM repair manual... 2003TJ

Trans is a 42RLE - an electrical controlled trans. First step in trouble shooting would be SCAN* for codes.
The description you gave not shifting suggests trans in LIMP mode, a default setting to 'limp' home, and that would set transmission codes.

Hold off on a shop that wants to R&R without scanning, or doing troubleshooting.

*transmission codes require a capable scanner - professional quality not a simple code reader.

You want the system scanned.
I am hoping the mechanic checked fluid level and condition...
 

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