I thought when in 4x4 lock it transferred to "more or less FWD" at 35 (with the other wheels getting power as ESP deigns) , Gramps will know for sure. there is a thread on this somewhere. if hes not around Ill try to find the thread.
as for power (this is a CVT?), try just "D"rive and floor it, it will allow the engine to sit at 6000 rpm and allow tranny to select the best ratio for acceleration. you may be overriding it when you select the gear ratio yourself. our pat has pretty decent highway power. Im never afraid to merge or pass.
[COLOR="DarkRed"]2000 Cherokee Sport 4.0L Selec Trac[/COLOR] - mine - for occasional wheeling
[COLOR="DarkGreen"]2007 Patriot 2.4L FD I 4x4[/COLOR] - wifes - doomed to rarely leave the street