Chevrolet Silverado / GMC Sierra. Service manual — part 1552

which could cause the symptom.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the
symptom:

Leak at Front Slip Yoke

Universal Joint Noise

Ping, Snap, or Click Noise

Knock or Clunk Noise

Scraping Noise

Squeak Noise

Shudder on Acceleration at Low Speed

LEAK AT FRONT SLIP YOKE

Checks

Action

DEFINITION: A few drops of lubricant that are leaking from the splined yoke are normal.
This condition does not require attention.
The slip yoke barrel is
burred, nicked, corroded, or
worn or the welch plug is
leaking.

1. Inspect the slip yoke for burrs.

Careful use of crocus cloth or fine stone honing can
remove minor burrs.

2. If the yoke is badly burred, corroded, or worn, replace

the yoke.

3. If the welch plug is leaking replace the yoke. Refer to

Universal Joint Replacement - Nylon Injected Ring
or Universal Joint Replacement - External Snap
Ring.

4. Replace the oil seal. Refer to one of the following

procedures:

For vehicles equipped with the MP
1222/1225/1226-NQG transfer case, refer to Rear
Output Shaft Seal Replacement .

For vehicles equipped with the MP 1625/1626-
NQF transfer case, refer to Rear Output Shaft

2008 Chevrolet Silverado 1500

2008 DRIVELINE/AXLE Propeller Shaft - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

UNIVERSAL JOINT NOISE

Seal Replacement .

For vehicles equipped with the MP 3023/3024-
NQH transfer case, refer to Rear Output Shaft
Seal Replacement .

For vehicles equipped with the 4L60-E automatic
transmission, refer to Propeller Shaft Front Slip
Yoke Oil Seal Replacement .

For vehicles equipped with the 6L50/6L80/6L90
transmission, refer to Transmission Output Shaft
Seal Replacement .

For vehicles equipped with the Allison
transmission, refer to Rear Propshaft Shaft Seal
Replacement .

There is a faulty oil seal in
the transmission or in the
transfer case output shaft.

Replace the oil seal. Refer to one of the following procedures:

For vehicles equipped with the MP 1222/1225/1226-
NQG transfer case, refer to Rear Output Shaft Seal
Replacement .

For vehicles equipped with the MP 1625/1626-NQF
transfer case, refer to Rear Output Shaft Seal
Replacement .

For vehicles equipped with the MP 3023/3024-NQH
transfer case, refer to Rear Output Shaft Seal
Replacement .

For vehicles equipped with the 4L60-E automatic
transmission, refer to Propeller Shaft Front Slip Yoke
Oil Seal Replacement .

For vehicles equipped with the 6L50/6L80/6L90
transmission, refer to Case Extension and Gasket
Replacement .

For vehicles equipped with the Allison transmission,
refer to Rear Propshaft Shaft Seal Replacement .

Problem

Action

One or more of the universal Replace the universal joint. Refer to Universal Joint

2008 Chevrolet Silverado 1500

2008 DRIVELINE/AXLE Propeller Shaft - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

PING, SNAP, OR CLICK NOISE

KNOCK OR CLUNK NOISE

SCRAPING NOISE

joints are worn or damaged. Replacement - External Snap Ring or Universal Joint

Replacement - Nylon Injected Ring.

One or more of the universal
joints have lost lubricant.

Replace the universal joint. Refer to Universal Joint
Replacement - External Snap Ring or Universal Joint
Replacement - Nylon Injected Ring.

The yoke retainer strap bolts
are loose.

Tighten the yoke retainer strap bolts to specifications. Refer to
Fastener Tightening Specifications.

Checks

Action

DEFINITION: A ping, snap or click is usually heard on initial load after the transmission is
in gear, either in forward or reverse.
A loose pinion yoke or
companion flange.

Tighten the bolts and the pinion nut to specified torque. Refer
to Fastener Tightening Specifications.

One or more of the universal
joints are worn or damaged.

Replace the universal joint. Refer to the following:

Universal Joint Replacement - Nylon Injected Ring

Universal Joint Replacement - External Snap Ring

Heat shield interference

Eliminate interference.

Checks

Action

DEFINITION: Knocking or clunking noise occurs when operating the vehicle in high gear
or coasting in NEUTRAL at 16 km/h (10 mph).
One or more of the universal
joints are worn or damaged.

Replace the universal joint. Refer to the following:

Universal Joint Replacement - Nylon Injected Ring

Universal Joint Replacement - External Snap Ring

The side gear hub
counterbore in the
differential is wornoversize.

Replace the differential case and/or the side gears. Refer to
Differential Replacement (8.6, 9.5/9.5LD Inch Axles) or
Differential Replacement (10.5 Inch, 11.5 Inch Axle) .

Checks

Action

DEFINITION: A scraping noise occurs when driving the vehicle at various speeds.

2008 Chevrolet Silverado 1500

2008 DRIVELINE/AXLE Propeller Shaft - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

SQUEAK NOISE

SHUDDER ON ACCELERATION AT LOW SPEED

The pinion flange deflector
or the center bearing is
rubbing.

Correct the interference as necessary.

Center bearing heat shield,
if equipped.

Correct the interference as necessary.

Exhaust pipe contact.

Correct the interference as necessary.

Balance weight detached
from the propeller shaft.

A detached balance weight may create a sliding, scraping, or
tickling type noise during acceleration or deceleration.

1. Inspect the propeller shaft and tube for a detached

balance weight.

2. Replace components as required. Do not attempt to

reattach the balance weight to the propeller shaft.

Checks

Action

DEFINITION: When driving the vehicle at various speeds a squeaking sound occurs.
One or more of the universal
joints have lost lubricant.

Replace the universal joint. Refer to the following:

Universal Joint Replacement - Nylon Injected Ring

Universal Joint Replacement - External Snap Ring

C/V boot worn or torn.

Replace components as necessary.

Center bearing is dry or
worn.

Lube or replace the center bearing.

Checks

Action

DEFINITION: When the vehicle is accelerating at low speed a shudder occurs.
The yoke retainer strap bolts
are loose or missing.

Replace or tighten the yoke retainer strap bolts to
specifications. Refer to Fastener Tightening Specifications.

The driveline joint angle is
excessive or incorrectly set.

Determine if the driveline angle is incorrect and correct as
necessary. Refer to Diagnostic Starting Point - Vibration
Diagnosis and Correction .

One or more of the universal
joints are worn or damaged.

Replace the universal joint. Refer to the following:

Universal Joint Replacement - Nylon Injected Ring

2008 Chevrolet Silverado 1500

2008 DRIVELINE/AXLE Propeller Shaft - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado