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2008 Dodge Ram 1500/2500/3500 Front Axle Service Repair

Time:2018-09-28 09:12Turbochargers information Click:

dodge 1500 3500 2500 Fron

FRONT AXLE 
FRONT AXLE DESCRIPTION
FRONT AXLE OPERATION
FRONT AXLE DIAGNOSIS AND TESTING

FRONT AXLE - DESCRIPTION

The axle consists of an alumunum center section
with an axle tube extending from one side. The tube
is pressed into the differential housing. The power is
transferred from the axle through two constant velocity
(C/V) drive shafts to the wheel hubs. The drive
shafts are identical and interchangeable.

FRONT AXLE - OPERATION

The axle receives power from the propeller shaft.
The propeller shaft is connected to the pinion gear
which rotates the differential through the gear mesh
with the ring gear bolted to the differential case. The
engine power is transmitted to the axle shafts
through the pinion mate and side gears. The side
gears are splined to the axle shafts.

FRONT AXLE - DIAGNOSIS AND TESTING

GEAR NOISE

lubricant, incorrect backlash, tooth contact, worn/damaged
gears or the carrier housing not having the proper
offset and squareness.


Gear noise usually happens at a specific speed
range. The noise can also occur during a specific type
of driving condition. These conditions are acceleration,
deceleration, coast, or constant load.


When road testing, first warm-up the axle fluid by
driving the vehicle at least 5 miles and then accelerate
the vehicle to the speed range where the noise is
the greatest. Shift out-of-gear and coast through the
peak-noise range. If the noise stops or changes
greatly:


² Check for insufficient lubricant.
² Incorrect ring gear backlash.
² Gear damage.


Differential side gears and pinions can be checked
by turning the vehicle. They usually do not cause
noise during straight-ahead driving when the gears
are unloaded. The side gears are loaded during vehicle
turns. A worn pinion mate shaft can also cause a
snapping or a knocking noise.

BEARING NOISE

The axle shaft, differential and pinion bearings can
all produce noise when worn or damaged. Bearing
noise can be either a whining, or a growling sound.
Pinion bearings have a constant-pitch noise. This
noise changes only with vehicle speed. Pinion bearing
noise will be higher pitched because it rotates at a
faster rate. Drive the vehicle and load the differential.
If bearing noise occurs, the rear pinion bearing
is the source of the noise. If the bearing noise is
heard during a coast, the front pinion bearing is the
source.
Worn or damaged differential bearings usually produce
a low pitch noise. Differential bearing noise is
similar to pinion bearing noise. The pitch of difference
with vehicle speed.
Axle shaft bearings produce noise and vibration
when worn or damaged. The noise generally changes
when the bearings are loaded. Road test the vehicle.
Turn the vehicle sharply to the left and to the right.
This will load the bearings and change the noise
level. Where axle bearing damage is slight, the noise
is usually not noticeable at speeds above 30 mph.

LOW SPEED KNOCK

Low speed knock is generally caused by a worn
U-joint or by worn side-gear thrust washers. A worn
pinion shaft bore will also cause low speed knock.
VIBRATION
Vibration at the rear of the vehicle is usually
caused by:
² Damaged drive shaft.
² Missing drive shaft balance weight(s).
² Worn or out of balance wheels.
² Loose wheel lug nuts.
² Worn U-joint(s).
² Loose/broken springs.
² Damaged axle shaft bearing(s).
² Loose pinion gear nut.
² Excessive pinion yoke run out.
² Bent axle shaft(s).
Check for loose or damaged front end components
or engine/transmission mounts. These components
can contribute to what appears to be a rear end
vibration. Do not overlook engine accessories, brackets
and drive belts.
All driveline components should be examined
before starting any repair.

DRIVELINE SNAP

A snap or clunk noise when the vehicle is shifted
into gear (or the clutch engaged) can be caused by:
² High engine idle speed.
² Transmission shift operation.
² Loose engine/transmission/transfer case mounts.
² Worn U-joints.
² Loose spring mounts.
² Loose pinion gear nut and yoke.
² Excessive ring gear backlash.
² Excessive side gear to case clearance.
The source of a snap or a clunk noise can be determined
with the assistance of a helper. Raise the vehicle
on a hoist with the wheels free to rotate. Instruct
the helper to shift the transmission into gear. Listen
for the noise, a mechanics stethoscope is helpful in
isolating the source of a noise.

DIAGNOSTIC CHART

Wheel Noise

1. Wheel loose.
1. Tighten loose nuts.
2. Faulty, brinelled wheel bearing.
2. Replace bearing.
Axle Shaft Noise
1. Misaligned axle tube.
1. Inspect axle tube alignment. Correct as necessary.
2. Bent or sprung axle shaft.
2. Inspect and correct as necessary.
3. End-play in pinion bearings.
3. Refer to pinion pre-load information and correct as necessary.
4. Excessive gear backlash between the ring gear and pinion.
4. Check adjustment of the ring gear and pinion backlash. Correct as necessary.
5. Improper adjustment of pinion gear bearings.
5. Adjust the pinion bearings pre-load.
6. Loose pinion yoke nut. 6. Tighten the pinion yoke nut.
7. Scuffed gear tooth contact surfaces.
7. Inspect and replace as necessary.

Axle Shaft Broke

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