I don't understand what you mean this must be an automatic transmission what is first .
If so and the transmission fluid looks OK
First is drive dose the 4 wheel work
So you can't drive the vehicle in forward motion .
Neutral reverse and park at best can make go backwards .
The good news is it dosen't sound like the tranny is shot do you have other electrical problems or it also could be a linkage problem if cable or VACUUM operated .
SOURCE: 2001 jeep grand cherokee wont shift out of first
Check shift cable. Disconnect cable at tranny and move linkage by hand then reconnect cable and see if the cable moves the linkage the same amount.
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