I have a 2000 grand cherokee with a 4.0. it takes for ever to shift out of 1st gear, the engine revs up to 3000rpm. Any ideas?

Try dropping and cleaning the pan, changing the filter, and refilling with ATF+4. Repeat this procedure every 30,000 miles.

Here's how to easily do a super job yourself:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-10.html#post1873132