Pinpoint Test G: STRAIGHTLINE Driveline Wind-Up

WARNING: This page is about a different variant/trim than selected.

NOTE: 4X4 is not intended for driving on hard/dry surfaces; using 4X4 mode while driving on these surfaces may produce noises like intermittent clunking, but will not damage driveline components.

G1 VERIFY THE CONCERN
- Drive the vehicle and switch from 4X4 AUTO mode to 4X4 mode. There should be minimal wind-up in 4X4 mode during straight line maneuvers (wind-up in turns is normal; 4X4 mode is not intended for driving on hard/dry surfaces).
- Is excessive wind-up present?
  1. Yes : GO to G2.
  2. No : RETURN the vehicle to the customer. ADVISE about correct 4WD system operation and normal vehicle behavior.
G2 CHECK FOR MATCHING WHEEL AND TIRE SIZES
- Check the wheel and tire sizes.
- Do the 4 wheel and tire sizes match?
  1. Yes : GO to G3.
  2. No : ADVISE the customer that 4WD systems require 4 matched, correctly inflated, correctly maintained tires to operate correctly.
G3 CHECK TIRE WEAR
- Check each of the 4 tires for wear.
- Are the 4 tires worn evenly?
  1. Yes : GO to G4.
  2. No : ADVISE the customer that 4WD systems require 4 matched, correctly inflated, correctly rotated tires to operate correctly.
G4 CHECK TIRE INFLATION PRESSURE
- Check the inflation pressure in each tire. Refer to Vehicle Certification (VC) label.
- Are the tire inflation pressures correct?
  1. Yes : GO to G5.
  2. No : ADJUST the tire pressure as necessary. TEST the vehicle for normal operation. ADVISE the customer that 4WD systems require 4 matched, correctly inflated, correctly maintained tires to operate correctly.
G5 CHECK THE FRONT AND REAR AXLE RATIOS
- Check that front and rear axle ratios match. Refer to DRIVELINE SYSTEM - GENERAL INFORMATION .
- Do the front and rear axle ratios match?
  1. Yes : RETURN the vehicle to the customer and ADVISE about correct 4WD usage and normal vehicle behavior.
  2. No : CHECK the Vehicle Identification Label (VIL). INSTALL the correct axle(s). REFER to REAR DRIVE AXLE/DIFFERENTIAL - FORD 9.75-INCH RING GEAR and FRONT DRIVE AXLE/DIFFERENTIAL . TEST the system for normal operation.