Pinpoint Test V: Transmission Rumble/Growl - Noise At Higher Speeds In Forward Gears, More Pronounced In A Coast/Deceleration Condition

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

Normal Operation and Fault Conditions
- Axle howl or whine
  - The MT88 transmission may be suspect of a gear whine noise, which seems to be emanating from the front or rear of the vehicle at or in excess of 80 km/h (50 mph) at full operating temperature. Drive the vehicle at customer complaint speeds in 4th gear (this is the direct gear) to eliminate manual transmission as noise source, reach full operating temperature and confirm if noise is still present. If noise is not present, proceed with gear noise analysis.
  - If noise is still present, REFER to: Rear Drive Axle and Differential REFER to: Front Drive Axle
- Incorrect driveline angle
  - Check the driveline angle. Repair as necessary. REFER to: Driveshaft Angle Measurement
- Driveshaft out of balance or damaged
  - Check the driveshaft for damage, missing balance weights, or undercoating. Refer to the driveshaft balance test. REFER to: Driveshaft Runout and Balancing
Possible Sources
- Axle noise
- Incorrect driveline angle
- Damaged or out of balance driveshaft
Diagnostic steps are not provided for this symptom or DTC. REFER to: Diagnostic Methods