Welcome to WF
and if u dont know about the jeep wave: wave to every other jeep you see
naow about ur problme there, i assume on any other car your good wiht a clutch so that leaves us with something being wrong with the clutch mechanism somehow, now to get this straigh in firt gear you had the clutch engaged adn then it slipped off and disengaged? of did the gear shift move and it popped out of gear? of what, a littl emore explanation would help
or it could just be that you need to give it some gas b/c of the bigger tires or something
btw sounds like a great jeep!