Avetlink AK Differential Gearbox: Quieter Operation and Reliable Sealing
Unusual gear noise, oil leaks, and rear axle wear can interrupt deliveries and increase repair costs. Drivers may hear clicking over speed bumps or need to top up the gear oil frequently.
The Avetlink AK differential gearbox combines hardened spiral bevel gears, an aluminum alloy housing, improved sealing, and a friction-plate limited-slip mechanism for demanding electric cargo tricycle applications.
Precision Construction and Reported Performance
Specified component dimensions use IT7 dimensional tolerances to support accurate fitting.
Reported testing shows:
- 40% lower noise compared with conventional differential assemblies.
- No observed oil leakage after 500 km of continuous rough-road testing.
- Left-to-right wheel torque difference within 5% under the test conditions.
- 60% lower rear axle wear rate.

Three Key Features
1. Hardened, Low-Noise Gears
The spiral bevel gears undergo carburizing and quenching, reaching a tooth-surface hardness of HRC 58–62. Reported noise during high-speed operation is below 75 dB.
2. Effective Sealing and Pressure Control
Double-lip fluoroelastomer oil seals and a pressure-relief valve help prevent leakage. The seals and precision-fitted aluminum housing support operation within the specified −30°C to 120°C temperature range.
3. Friction-Plate Limited-Slip Design
The limited-slip mechanism helps reduce excessive wheel spin when traction differs between the rear wheels. It can transfer more torque toward the wheel with better grip, supporting traction on slippery roads.
The 5% torque-difference figure describes the reported test result; limited-slip operation can produce a different torque split when road grip changes.
Feedback from a Shandong Logistics Fleet
After replacing its differential assemblies, a Shandong logistics fleet reported:
- 30% better climbing performance.
- An oil-change interval extended from two months to six months under its operating conditions.
These improvements helped the fleet reduce maintenance interruptions during daily cargo transport.
Maintenance Tips
- Check oil level weekly: Inspect with the vehicle level and the gearbox cool. Follow the designated indicator, with a target reading of 1/2–2/3 of the marked scale.
- Inspect oil condition monthly: Check for unusual darkening, contamination, or deterioration, and replace the oil when required.
- Change gear oil every 5,000 km: Use the specified hypoid gear oil suitable for the limited-slip mechanism. Follow the maintenance schedule applicable to your vehicle’s operating conditions.
- Investigate unusual noise promptly: If buzzing or clicking develops, have the gears and bearings inspected. The specified gear backlash range is 0.15–0.30 mm.
- Keep cargo balanced: Secure the load evenly and keep its center-of-gravity offset within 10 cm, measured from the loading reference defined for the vehicle.
Choose Avetlink AK for Your Cargo Drivetrain
Contact Avetlink with your vehicle specifications, operating load, and mounting dimensions to select a suitable AK differential configuration.
specified oil level and follow the servicing requirements for your AK configuration.

Item	Value
Number of Teeth	14 teeth or 16 teeth
Installation Method	One-piece or split body
Shift Control	Shift gears or Unchanged file
Color	Customizable
Place of Origin	China