2008 jeep wrangler x, right hand drive, dtc p0765. Transmission keeps going into limp mode. Have replaced speed sensors, solenoid block, and wiring connector to block. Still gets stuck in second.

SOURCE: dtc p0441

reset light and make sure gas cap is secure.

SOURCE: 01 jeep Grand Cherokee transmission problem

Reboot system by disconnecting negative terminal on Battery, with ignition Key on and engine not running, remove terminal for more than two minutes and connect it back, it will spark a little do not panic, and try it again

SOURCE: 02 jeep grand cher. stays in 1st gear till 4500

Which trans do you have??? The 4.7 has the 45RFE and the 4.0 has the 42RE. If you have the 42RE, try replacing the connector on the output speed sensor. I have seen intermittent problems with the connectors as they get older leading to falling into low gear and not shifting up

SOURCE: 93 jeep wrangler stuck in second gear

If your clutch is operating properly, the problem is inside the transmission, either shift forks or lost adjustment on rails. You may have damaged the brass synchro gears by not taking care of this right away. First though, make sure the clutch is releasing, check for internal bypassing ,leaks and slave cylinder operating properly (some slaves are part of throwout bearing and cannot be serviced unless trans is removed)

SOURCE: 99 jeep wrangler 4.0 won't start

yes the crank sensor is probebly your problem.