Vibrations and “Droning” from the Gearbox / Drive Train at Highway Speeds

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Vibrations and “Droning” from the Gearbox / Drive Train at Highway Speeds

There are multiple reports from Bravo users of noticeable vibrations, humming o r droning noises coming from beneath the car when cruising at roughly 80-100 km/h, which seem to be transmitted through the gearbox o r drive train. Considering that the Bravo uses an 800 cc 3-cylinder engine and 4-speed manual transmission, what are the most likely transmission o r drivetrain related fault sources e.g., worn transmission bearings, imbalance in drive shafts, poor gear mesh, inadequate insulation o r mounting, and how should an owner approach diagnosing these — especially with limited spare parts availability and service network in Pakistan?

Talha Kyanii asked on 08 Nov 2025 10:15:39 am

1 Answer

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Talha Kyanii - on 08 Nov 2025 10:23:38 am

Common Causes:

Worn o r imbalanced drive shafts: Bravo’s CV joints o r shafts can develop play, causing vibrations.

Loose o r cracked engine/transmission mounts: Cheap rubber mounts wear quickly on rough Pakistani roads.

Transmission bearing wear: Leads to humming o r whining sound that increases with speed.

Poor insulation o r alignment: The small body amplifies drivetrain resonance, especially around 90 km/h.

How to Diagnose:

Check wheel balance and alignment first — rule out tire issues.

Inspect engine and gearbox mounts for cracks o r sagging.

Lift the car and check CV joints for grease leakage o r excessive play.

If vibration persists, drain gearbox oil and look for metal shavings indicating internal wear.

Fix / Maintenance:

Replace worn mounts and CV joints Suzuki-compatible parts often fit.

Use quality tires Euro Star o r Dunlop and ensure proper balancing.

If transmission bearings are faulty, a rebuild o r used replacement gearbox may be more economical.