Off Road Model
“The PRO-4X is our sporty off road truck in the lineup. We’re
very excited about it. It retains all of the previous equipment
that the off-road package had – locking diff, Rancho shocks, very
large tires [P275/70R18 BFGoodrich Rugged Trails] – and adds to
it a special front end appearance with body colored front and rear bumpers
and a beautiful interior that includes white gauges and a metallic feel
inside the truck,” says Fisher.
also has 18-inch wheels, two extra skid plates, a lower 3.36:1 final
gear ratio, and GKN’s Electronic Differential
Lock (EDL) - the only full size pickup with an optional electric
rear diff locker.
a King Cab PRO-4X off road at Apple Valley Farms near Sand Creek, Wisconsin.
The park’s tight paths run through deep thickets of
trees and open tracts of farmland, and up and down rolling hills. They’re
surfaced with fine brown sand that has the consistency of talc and billows
into large dust clouds when disturbed by tires or wind. Sandstone punctuates
its deeply rutted trails on top of and under the sand, making for constantly
changing traction conditions.
the truck for off-road enthusiasts. In stock form, the PRO-4X is an
excellent ground pounder with performance that we’d
place near or at the top of half-ton pickups. It exhibited
better trail manners than the Double Cab Toyota Tundra TRD 4x4 we
drove recently at Hollister Hills in Northern California.
was excellent with little jounce transferred from the specially tuned
suspension into the cabin to toss the driver and passengers around as
we climbed into and out of channels carved in the trails. The sightlines
are better too over the truck’s nose. In general
the Titan just drives smaller than the Tundra off road.
It’s wide on the trails though.
small trees along the sandy paths quickly pinstriped the truck with
all sorts of abstract patterns that traced the trail’s frequently
shifting topographical modulation on its sides. The optional tow package’s
extendable mirrors didn’t benefit either. Even pulled in they were
whacked pretty good twice against branches.
Toyota have different philosophical approaches to off roading. Titan
lets the driver have more control while Tundra mostly lets a computer
decide what’s best.
offer automatic hill descent assist for the Titan, like the nice setup
the Tundra has. Instead, in 4-Lo, the transmission is dynamically
remapped to provide slower throttle response to help manage the vehicle
down steep grades or in tough spots on the trail.
a trade-off between having hill descent control or a true locking diff,
say Nissan made the better call by continuing to offer the Eaton E-locker,
which is activated only at the driver’s discretion
to get the pickup out of low traction situations. It's a brute force,
low complexity solution that just plain works.
mechanical differentials all together to control slip, instead using
stability and antilock brake systems to actively manage power distribution
and braking independently at each wheel until traction is regained. However,
in high or low 4WD, the Tundra’s automatic limited slip diff can’t
be turned off by the driver. This can potentially cause issues in extremely
low traction environments, like loose mud, when the computer decides
to apply the brakes to control wheel spin and unintentionally winds up
canceling out driver efforts applying power to keep the truck moving
so it won’t
you want a deeper introduction to differentials and how they work,
please see our earlier article about Eaton's