Roughness or Vibration Above 56km/h
Problem | Action |
|---|---|
DEFINITION: One hears or feels a roughness when driving the vehicle above 56 km/h (35 mph). | |
The tires are unbalanced or worn. | Balance or replace the tires. Refer to Balancing Tires and Wheels in General Information or Tire Mounting and Dismounting . |
Roughness or Vibration General Diagnosis
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Inspect the center bearing. Is the bearing worn? | -- | Go to Step 2 | Go to Step 3 |
2 | Replace the center bearing. Center Bearing Replacement . Is roughness or vibration still evident? | -- | Go to Step 3 | System OK |
3 | Inspect the hanger. Is the hanger worn? | -- | Go to Step 4 | Go to Step 5 |
4 | Replace the hanger. Is roughness or vibration still evident? | -- | Go to Step 5 | System OK |
5 | Inspect the universal joints. Do the universal joints require lubrication? | -- | Go to Step 6 | Go to Step 7 |
6 | Lubricate the universal joints. Refer to Fluid and Lubricant Recommendations in Maintenance and Lubrication. Is roughness or vibration still evident? | -- | Go to Step 7 | System OK |
7 | Inspect the universal joints. Are the universal joints worn? | -- | Go to Step 8 | Go to Step 9 |
8 | Replace the universal joints. Refer to Universal Joint Replacement . Is roughness or vibration still evident? | -- | Go to Step 9 | System OK |
9 | Inspect the flange bolts. Are the bolts loose? | -- | Go to Step 10 | Go to Step 11 |
10 | Tighten the flange bolts to specification. Refer to Fastener Tightening Specifications . Is roughness or vibration still evident? | -- | Go to Step 11 | System OK |
11 | Inspect the tires. Refer to Tire and Wheel Inspection in Vibration Diagnosis and Correction. Are the tires worn or out of balance? | -- | Go to Step 12 | Go to Step 13 |
12 | Balance or replace the tires as necessary. Refer to Tire and Wheel Balancing in Vibration Diagnosis and Correction or Tire Mounting and Dismounting in Wheels and Tires. Is roughness or vibration still evident? | -- | Go to Step 13 | System OK |
13 | Inspect the companion flange. Are there burrs or gouges on the companion flange? | -- | Go to Step 14 | Go to Step 15 |
14 |
Is roughness or vibration still evident? | -- | Go to Step 15 | System OK |
15 | Inspect the propeller shaft. Refer to Diagnosing First-Order Driveline Vibration in Vibration Diagnosis and Correction. Is the propeller shaft unbalanced? | -- | Go to Step 16 | Go to Step 17 |
16 |
Is roughness or vibration still evident? | -- | Go to Step 17 | System OK |
17 | Inspect the parking brake drum. Refer to Brake Drum Inspection in Park Brake. Is the parking brake drum worn? | -- | Go to Step 18 | Go to Step 19 |
18 | Replace the parking brake drum. Refer to Brake Drum Replacement in Park Brake. Is roughness or vibration still evident? | -- | Go to Step 19 | System OK |
19 | Inspect the rear joint angle. Refer to Diagnosing Second-Order Driveline Vibration in Vibration Diagnosis and Correction. Is the angle too large or too small? | -- | Go to Step 20 | Go to Step 21 |
20 | Correct the rear joint angle. Is roughness or vibration still evident? | -- | Go to Step 21 | System OK |
21 | Inspect the slip yoke spline. Is the slip yoke spline excessively loose? | -- | Go to Step 22 | Go to Step 23 |
22 | Replace the parts as necessary. Is roughness or vibration still evident? | -- | Go to Step 23 | System OK |
23 | Inspect the yokes. Are the yokes distorted or damaged? | -- | Go to Step 24 | Go to Step 25 |
24 | Install the new yokes. Is roughness or vibration still evident? | -- | Go to Step 25 | System OK |
25 | Inspect for propeller shaft phasing. Refer to Diagnosing Second-Order Driveline Vibration in Vibration Diagnosis and Correction. Are the yokes out of parallel to each other? | -- | Go to Step 26 | Go to Step 27 |
26 | Correct the propeller shaft phasing. Is roughness or vibration still evident? | -- | Go to Step 27 | System OK |
27 | Inspect the propeller shaft. Is there dirt or debris on the propeller shaft? | -- | Go to Step 28 | Go to Step 29 |
28 | Clean the propeller shaft. Is roughness or vibration still evident? | -- | Go to Step 29 | System OK |
29 | Inspect the propeller shaft. Is the propeller shaft bent or dented? | -- | Go to Step 30 | -- |
30 | Replace the propeller shaft. Refer to Propeller Shaft Replacement or Two-Piece Propeller Shaft Replacement or Three-Piece Propeller Shaft Replacement . Is roughness or vibration still evident? | -- | -- | System OK |
