Specifications

19
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Manual Shift 4x4 System
Electronic Shift-on-the-fly 4x4 System
Dual Rear Wheels (DRW)
Traction Control
PERFORMANCE/HANDLING
This page is about:
2009 F-250/F-350/F-450
Super Duty
®
Pickups
Performance/Handling
August 2008
F-250/F-350/F-450
SD Pickups
Electronic Shift-on-the-fly System
•Easy-to-userotarycontrolswitchmountedinthe
instrument panel used to select drive settings,
eliminating the need to stop and back up to
unlock the front hubs
•Electricmotoractuallyshiftsthetransfercase
into selected drive setting
•FronthublockselectorsaremarkedwithAUTO
and LOCK. Manual override capability lets the
driver manually LOCK hubs if preferred, but the
Pulse Vacuum Hublock (PVH) design engages the
front hubs, providing virtually silent operation
•PVHsystemoptimizesfueleconomybecauseall
front driveline components are disconnected at
the wheels when the system is in 2WD operation
NOTE: Both of these 4x4 systems are “part-time”
systems designed to provide enhanced traction
on reduced traction surfaces only. Operating
on normal or high-traction surfaces can result in
transfer case damage, increased tire wear and
decreased fuel economy.
4x4 Systems
Performance Specifics
Dual Rear Wheels (DRW)
•Either4x2or4x4drivesystem
•Increasereartraction
•Improvetowingstability
•Provideincreasedrearaxle
weight ratings
Super Duty
®
4x4 Manual
Shift Lever
Super Duty
Manual-locking
Front Hub
Super Duty
Rotary Switch
Super Duty
Automatic-locking
Front Hub with
Manual Override
A CLOSER LOOK: F-Series Super Duty
®
The large and responsive F-Series Super Duty braking
systemincludes:
• Largeventedfrontandrearrotors
• Large,stiffcalipers
• Four-wheelAnti-lockBrakingSystem(ABS)
with excellent low-speed resolution
• Brakepadmaterialengineeredtohelpprovidelonglife,quiet
operation and confident pedal feel, whether lightly loaded or
at full Gross Vehicle Weight
• Excellentstoppingpowerandbrakeperformance
Traction Control
•Optionalon4x2and4x4models
•Helpsimprovetractionorlimitswheelspinonslipperyorloosedrivingsurfaces
•Reducesenginepowerthroughfuelcutofforignitionsparkcontrol
•Usesenginetorquetomanagewheelspin,amoreprecisemethodthanbrake-
controlled traction systems
•Computeswheelspinfromthedifferentialandreducestorquetomatchthebest
traction to the wheels for that terrain
•Systemmaybedisabledwhenit’snotneeded
Manual Shift with Manual Locking Hubs
•Simple,reliabledesignthatishighlyregardedby
serious off-roaders
•Toengagethefrontaxle,theoperatormuststop,
exit the vehicle and rotate both hublock selector
knobs to the LOCK position, then the desired drive
range is selected on the transfer case
•Floor-mountedtransfercaseshiftleverisusedto
movebetweenavailabledrivesettings:
2H (2WD), 4H (4x4 High), N (Neutral)
and 4L (4x4 Low)
•WhenthehublocksarereturnedtotheFREE
position, the drive axle components do not
rotate while driving, which reduces wear and
frictional drag