Sportrak no 4x4 drive.


Hi! all
Sportrak 1992 elxi auto hubs
Tryed to pull my boat up the slipway tueday, put it in 4x4 & it All lock up could not go back or forward it was as if transmition was seized after few mins shunting back fourth it freed but no 4x4 drive next day jack all four wheels started up & put in 4x4 back drive only looked at the front axle front prop spins, & drivers half shaft spins, are both half shafts ment to spin? if so the mate side is broke & hubs seized.
Can any one give any more help on this what do i need do is it a big job.

Thanks any help!