ALMOST DAILY FRONT LEFT WHEEL SHIMMY AT 35-55 MPH. FIRST STARTED ABOUT 1991 AND OCCASIONALLY FIXED BY ALIGNMENT, WHEEL BALANCING, TIRE ROTATION, DUAL FRONT STEERING STABILIZERS, BUT RECENTLY THE PROBLEM HAS WORSENED. I AM UNABLE TO DRIVE THE VEHICLE AT HIGHWAY SPEED FOR FEAR OF THE WHEEL SHIMMY OCCURING AT THE 35-55 MPH RANGE. W…
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ALMOST DAILY FRONT LEFT WHEEL SHIMMY AT 35-55 MPH. FIRST STARTED ABOUT 1991 AND OCCASIONALLY FIXED BY ALIGNMENT, WHEEL BALANCING, TIRE ROTATION, DUAL FRONT STEERING STABILIZERS, BUT RECENTLY THE PROBLEM HAS WORSENED. I AM UNABLE TO DRIVE THE VEHICLE AT HIGHWAY SPEED FOR FEAR OF THE WHEEL SHIMMY OCCURING AT THE 35-55 MPH RANGE. WHEN SHIMMY STARTS I CAN TURN THE STEERING WHEEL TO THE RIGHT SLIGHTLY AND THE SHIMMY WILL GO AWAY TEMPORARILY. SHIMMY ONLY OCCURS WHILE DRIVING STRAIGHT, OR WHILE TURNING TO THE LEFT. AS A SIDE NOTE THE TRUCK DOES PULL TO THE RIGHT, MAKING ME COUNTER STEER TO THE LEFT, WHICH IS TEMPTING FATE WITH THE SHIMMY.*AK
A REVISED BRAKE LINING NOISE INSULATOR RESULTED IN A DECREASE IN THE THERMAL INSULATION BETWEEN THE BRAKE LINING AND THE FRONT BRAKE CALIPER PISTON. THIS CAUSED GREATER HEAT TRANSFER TO THE CALIPER PISTONS WITH THE POTENTIAL TO OVERHEAT THE BRAKE FLUID AND DIMINISH BRAKE EFFECTIVENESS DURING SEVERE BRAKING CONDITIONS.
Consequence & remedy
Consequence: INCREASED STOPPING DISTANCES AND INABLILITY TO HOLDVEHICLES ON A STEEP GRADE RESULTS IN INCREASED RISK OF ACCIDENT IN THE EVENT OFA SUDDEN STOP OR WHEN CONSTANT BRAKING IS NEEDED TO MANEUVER THROUGH AREAS WITHSTEEP GRADES.
Remedy: ADD SNAP-IN INSULATORS THAT ATTACH TO EACH OF THE FRONT BRAKE CALIPER PISTONS. IN ADDITION, VEHICLES WITH 7.5 L ENGINES WILL HAVE INSULATION ADDED TO THE ENGINE COMPARTMENT BRAKE LINES.
THE DUAL FUEL TANK SELECTOR VALVE MAY MALFUNCTION AND CAUSE AN OVERFILL CONDITION IN ONE OF THE FUEL TANKS, RESULTING IN AN OVERFLOW OF FUEL PAST THE FILLER CAP.
Consequence & remedy
Consequence: THE OVERFLOW OF FUEL PAST THE FILLER CAP CAUSES A FUELLEAKAGE, WHICH CAN RESULT IN A FIRE WHEN EXPOSED TO A SOURCE OF IGNITION.
Remedy: REPLACE THE DUAL FUEL TANK SELECTOR VALVE.
UNDER CERTAIN CONDITIONS, THE SNAP RING THAT LOCATES THE PARK GEAR ON THE OUTPUT SHAFT OF THE TRANSMISSION MAY FRACTURE.
Consequence & remedy
Consequence: WHEN THE GEAR IS PLACED IN PARK, THE PARK GEAR WOULD NOTENGAGE, ALLOWING THE TRUCK TO ROLL FREELY IF THE PARKING BRAKE IS NOT PROPERLYSET. THIS COULD RESULT IN AN ACCIDENT.
Remedy: INSTALL IMPROVED SNAP RING AND REVISED TRANSMISSION EXTENSION HOUSING.
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