Volkswagen 1.9 TDI ASZ 6-Speed Manual Gearbox

The Volkswagen 1.9 TDI ASZ 6-Speed Manual Gearbox is an exact-fit, factory-spec replacement designed to bring back your TDI’s genuine shift character. This 6-speed transaxle mounts directly to the ASZ engine’s bellhousing and connects with the stock cable linkage—no adapters or mods required—offering reliable, precise gear changes under any condition.

Compatible Models

• Golf IV 1.9 TDI ASZ (2003–2005)

• Jetta IV / Bora 1.9 TDI ASZ (2003–2005)

• Passat B5 1.9 TDI ASZ (2001–2005)

Construction & Durability

• Precision Casting: Bellhousing and case manufactured to OEM dimensions for seamless installation.

• Heat-Treated Components: Gears, shafts, and synchros heat-treated to resist the high torque of TDI engines.

• CNC Machining: All internal parts are machined to tight tolerances for smooth meshing and long life.

• Corrosion Resistance: Bearings and synchronizer rings receive protective coatings against corrosion and wear.

Performance Benefits

1. Smooth, Positive Shifts
   Crisp engagement and precise detents eliminate false neutrals—even under load.

2. Diesel-Optimized Spacing
   Ratios keep the ASZ engine in its ideal torque band for quick acceleration and fuel efficiency.

3. Reduced NVH
   New precision bearings and seals dampen drivetrain noise and vibration for a quieter cabin.

4. Long-Term Reliability
   Engineered for extended mileage and the demands of turbocharged diesel power without premature wear.

Installation & Maintenance Tips

• Pre-Install Prep: Replace the clutch kit, pilot bearing, and rear main seal to avoid future leaks.

• Alignment: Use an input-shaft alignment tool for perfect concentric fit with the engine.

• Break-In: Drive gently for the first 500 km to allow synchronizers to bed in properly.

• Service Interval: Change gearbox oil every 60 000 km using VW-approved 75W-85 GL-4 fluid.

Warranty

Every Volkswagen 1.9 TDI ASZ 6-Speed Manual Gearbox comes with a 6-month limited warranty on internal components, covering manufacturing defects and fluid leaks under normal use. Restore your VW’s authentic TDI shift feeling—no compromises.