How to fit a VW gearbox

Identify your gearbox first

VW gearboxes are stamped with a code on the casing. The code tells you the ratio set, the year and often which model the box came from. Getting this right matters — a Freeway Flier top gear is very different from a close-ratio Pro Street box.

Not sure what you have? Use our gearbox calculator or send us a photo of the code stamped on the casing and we will identify it for you.

Before you remove the old box

• Support the car safely and disconnect the battery.
• Disconnect the shift rod at the coupling under the rear seat or engine bay — do not force it.
• Remove the clutch cable or hydraulic slave, speedo cable, reverse light wiring and handbrake cables.
• Support the engine if it is staying in the car; on many Beetles the engine and box come out together.
• Undo the mount bolts and lower the box carefully. Gearboxes are heavy — use a jack or hoist.

Installing the replacement gearbox

1. Check the clutch alignment. A misaligned clutch plate makes the gearbox impossible to slide home and can damage the input shaft.
2. Lightly grease the input shaft splines and the nose bearing surface. Do not over-grease — excess grease gets thrown onto the clutch.
3. Offer the gearbox up squarely. Wiggling it in at an angle can chip the clutch plate or damage the first-gear bushing.
4. Start all mount bolts by hand before tightening anything. Tighten evenly to avoid stressing the casing.
5. Reconnect the shift rod and adjust the coupling so neutral is clearly centred and each gear selects cleanly.
6. Refit the clutch cable / slave, speedo cable, handbrake cables and reverse light wiring.
7. Top up the gearbox oil to the correct level with the specified grade.

Common fitting problems

• Gearbox will not slide fully home — usually clutch alignment or a bent input shaft. Never pull it in with the bolts.
• Grinding or difficulty selecting gears — check shift-rod adjustment and clutch free play before blaming the gearbox.
• Oil leaks from the nose cone — replace the seal and check the input shaft for wear before fitting.
• Noisy in top gear — worn bearings or incorrect end float. A refurbished box from us is built to correct tolerances.

When to bring it to us

Gearbox swaps are straightforward on a well-sorted car, but worn mounts, a tired clutch or the wrong ratios can turn a weekend job into a long one. We can supply a refurbished box, fit it and set the clutch and shift linkage up correctly.