MO16G10CM | Genuine Meritor® Manual Transmission Assembly

1. Control Over Power and Speed
Manual transmissions allow the driver to:
Choose exactly when to shift gears
Downshift for engine braking or climbing hills
Keep the engine in its optimal power band (torque/speed range)
This level of control is especially important in:
Heavy trucks
Off-road or rough terrain
Towing or hauling heavy loads
Performance driving / racing

2. Efficient Power Transfer
Manual gearboxes are generally more mechanically efficient than automatics.
Less power is lost through torque converters or hydraulic systems.
This can result in better fuel economy in certain situations (though not always in city driving).

3. Lower Cost and Maintenance
Manual transmissions usually have fewer moving parts than automatics.
They are often cheaper to manufacture, buy, and repair.
Particularly useful in fleets or commercial vehicles where cost control matters.

4. Durability in Heavy-Duty Use
In trucks, manual transmissions are often more durable under high loads.
They allow drivers to manage torque carefully, reducing stress on the drivetrain.
Less prone to overheating compared to automatics in long-haul or mountainous driving.

5. Driver Engagement & Skill
Many drivers prefer manuals for the increased engagement and skill involved.
It creates a more connected driving experience — especially in sports cars or classic vehicles.

Grinding sound when shifting — especially into 1st or reverse
Often caused by:
Worn synchronizers
Clutch not fully disengaging
Damaged gears or input shaft

2. Hard to Shift / Won’t Go Into Gear
Gear lever feels stiff, or won’t engage some gears
May only happen when cold or after long use
Possible causes:
Worn clutch or linkage
Bent shift fork
Low or dirty transmission fluid

3. Slipping Out of Gear
Transmission pops out of gear while driving (especially under load)
Caused by:
Worn gear teeth
Damaged detent springs
Faulty shift rail

4. Whining or Humming Noises
Whining that changes with speed can indicate:
Worn bearings
Bad gears
Low or contaminated fluid

5. Clutch Problems
Difficulty shifting even when pressing the clutch
May feel like clutch is dragging or slipping
Can indicate:
Worn clutch disc
Bad pressure plate
Leaking slave/master cylinder (in hydraulic systems)

6. Leaking Fluid
Manual transmissions use gear oil (usually thick and dark)
Leaks from input/output seals or case cracks can lead to:
Low oil levels
Gear overheating
Premature wear

7. Burning Smell
A burning smell (especially after heavy driving) may signal:
Overheated clutch
Overheated transmission fluid
Friction from internal damage

8. Gear Slippage (Inconsistent Power Transfer)
Engine revs, but vehicle doesn’t respond as expected
Common in performance or loaded vehicles going uphill
Indicates worn clutch or internal gear issues