The manual is in "H"(all time 4wd with a torsen
center differential) at all time while driving,
which gives a power split of 60/40(i believe) to
the rear/front wheels, giving great traction
during rain and snow and such...
When you go off road, you can still drive in "H",
but be aware that the vehicle stability control
(vsc) and the anti-lock brake system (abs) will
still be active and will control your gas and
brake when the wheels slip and slide and can
be unsafe in conditions other than flat trails...
Most times when off road, you will shift into "HL"
(4wd hi locked center differential), this being for
deep sand, rough trails, small mud puddles and
such...
When the trail is more difficult, and you need or
may need more power, then you shift into "LL"
(4WD low locked center differential), this is for
crawling over rocks real slow, for having more
power to go thru deep mud and water, and for
climbing steep grades...
Again, never substitute feathering the clutch
for power, as this will burn you clutch, the FJ
contains more than enough HP for almost all
situations, so let the engine and your right
foot do the work...
^^^ this is just some basics'...
Also, never run in "4wd locked"(4H or 4L) on
pavement or any other solid traction surface,
especially when turning, as the locked center
differential will not allow the front and rear
wheels to turn at different speeds, causing
binding in the drive-train and possibly braking
multiple components as in axles, differentials,
drive-shafts, transfer case, etc...
You can however run in on snow packed
pavement and such, since the wheels can
slide on the snow at different speeds when
needed, but as always, be careful when
making sharp turns as stated above, the
wheels will slip... use common sense and
care when driving is all !...
Also, once every other month (if you are on
a dirt road, or if you are out in heavy rain and
driving straight, as in on a highway doing no
more then 55mph) slide the shifter into HL for
2-3 miles(user manual list 10), and then slide
it back to "H" as this keeps all the parts lubed
and working smoothly, otherwise, when you
need 4wd, it may not engage due to internal
transfer case parts sticking in their position...
(the above statements are of my own opinion
and such)...
