Recognise these faults?

Volkswagen-Audi Group manual gearboxes are generally reliable, but when they fail, they fail in specific ways. If you are driving a VW Golf, Polo, Passat, Audi A3, or Seat Leon, look out for:

• The "2nd Gear Crunch": A grinding noise when shifting quickly from 1st to 2nd. (Common Synchromesh failure).

• The "Whine" at Speed: A constant droning noise that gets louder as you drive faster. (Bearing wear).

• The "Bang" & Loss of Drive: Sudden loss of power and a hole in the gearbox casing. (Differential Rivet Failure).

• Stiff Gear Change: Difficulty selecting gears, especially when the engine is cold.

Precision Engineering, Local Service

We are the Ayrshire specialists for:

Save your car. Upgrade your gearbox.

Don't write off your vehicle because of a dealer quote. Let us build you a stronger transmission for a fairer price.

The Dealer Solution:

Our Solution:

"You need a new gearbox." (Cost: £3,500+)

We fix the specific broken part.

We don't just repair. We Upgrade.

Many VAG gearboxes (specifically the 5-speed 02J/02T and 6-speed 02Q units) leave the factory with cost-saving measures that limit their lifespan. We reverse these engineering shortcuts.

1. The "Rivet-to-Bolt" Upgrade Factory differentials are held together with weak rivets. Over time, these shear off, fly through the casing, and destroy the gearbox.

• Our Fix: We drill out the weak rivets and replace them with High-Tensile Aerospace Grade Bolts. This makes the differential bulletproof.

2. Precision Bearing Pre-load (Shimming) Factory gearboxes are assembled quickly on a production line. Often, the "shimming" (the tightness of the bearings) is too loose or too tight, leading to premature wear.

• Our Fix: We use Timken or SKF uprated bearings and hand-measure the shimming to 0.01mm tolerance. This ensures your rebuilt gearbox runs smoother and lasts longer than a new one.

Volkswagen:

• Golf, Polo, Passat, Caddy, Transporter with gearbox types: 5-Speed (02J, 0A4), 6-Speed (02Q, 02S)

Audi:

• A1, A3, A4, TT with gearbox types: 6-Speed Manual (Quattro & FWD)

Seat:

• Ibiza, Leon, Ateca with gearbox types: 5 & 6 speed manual

Skoda:

• Fabia, Octavia, Yeti with gearbox types: 5 & 6 speed manual

Technician's Note: We also specialise in the VW Transporter (T5/T6) manual gearboxes, which often suffer from driveshaft spline wear. We fix this permanently.

Our Process: From Breakdown to Back on the Road

• Diagnostic Drive: We test drive the vehicle to isolate the noise (bearing vs. gear set).

• Removal & Strip: We remove the unit and strip it to the component level in our Kilmarnock workshop.

• Chemical Clean: Every gear and shaft is cleaned to reveal microscopic wear.

• The Rebuild: We replace worn synchros, install the Bolt Kit, and press in new Uprated Bearings.

• Refill & Test: Filled with OE spec oil and road-tested to ensure factory-smooth shifting.

Why Choose Mechtronic?

• Local Experts: Based in Kilmarnock, serving all of Ayrshire.

• 6-Month Warranty: We back our engineering with a 6-month / 6,000-mile warranty.

• Faster Turnaround: We rebuild on-site. No sending your gearbox away to a third party for weeks.

Don't let a crunching gear turn into a seized engine.

Catching a gearbox fault early saves the casing and shafts, keeping your repair bill low.