Eaton heavy-duty gearbox repaired at Trusted Mechanical, Lonsdale, southern Adelaide

Gearbox Repairs in Adelaide

Manual and automatic gearbox repairs done by an RAA Approved workshop in Lonsdale, honest diagnosis first, so you only pay for the repair your vehicle actually needs.

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What do gearbox repairs involve?

A grinding, whining, slipping or hard-to-select gearbox is stressful, and the quotes can be frightening. Here is the reassurance up front: gearbox repair is a range, not one job, and most faults are a contained repair rather than a full rebuild. We diagnose the actual fault first, tell you straight what it will take to fix, and never sell you a rebuild you do not need. This is part of our transmission services in Adelaide.

On a manual, that can mean replacing a worn clutch, selector, synchro, bearing or seal. On an automatic, it often means fault-finding and repairing solenoids, the valve body, or the fluid and filter. A full rebuild, where the unit is stripped and rebuilt, is only the right answer when the internals are genuinely worn out.

It helps to separate three things: a repair fixes the specific failed part, a rebuild strips and rebuilds the whole unit, and a replacement fits a reconditioned or exchange box. The right answer depends on a proper diagnosis, which is exactly what we do first. Tell us what your gearbox is doing and we will tell you what it needs.

Spicer differential assembly inspected during a gearbox repair at Trusted Mechanical, Adelaide

Signs your gearbox needs a look

These are the gearbox problems owners describe most often. If any of them sound like your vehicle, it is worth getting it diagnosed early, because caught in time most are a contained repair rather than a rebuild.

  • Grinding or crunching when changing gear - often a clutch or synchro issue on a manual, not the whole box.
  • Whining, humming or rumbling that changes with road speed - commonly a worn bearing.
  • Slipping, flaring or harsh shifts on an automatic - frequently the fluid, a solenoid or the valve body before anything internal.
  • Difficulty selecting gears, or a gear that pops out - usually the linkage, selector or a synchro.
  • A burnt smell, leaking fluid, or a warning light - often a simple fluid or seal fix when it is caught early.

Caught early, most of these are a contained repair, not a rebuild, which is exactly why getting it diagnosed quickly saves you money.

Manual and automatic - we work on both

Differential and gearbox components laid out during fault diagnosis at Trusted Mechanical, Adelaide

Whether you drive a manual or an automatic, we diagnose and repair both. Manual gearbox repair and automatic gearbox repair call for different skills and different parts, and we carry the experience for each. The diagnosis is the same principle in both cases: find the actual fault before recommending any work, so the result, and the saving, is real.

RAA-approved gearbox diagnosis and repair, Lonsdale

Honest diagnosis before any big job

We diagnose the actual fault before recommending anything. You get a straight explanation of what is wrong, what it will take to fix, and the realistic options - repair the failed part, recondition, or replace - with the cost of each, not a default jump to the most expensive rebuild.

RAA Approved Repairer. We are audited by RAA on exactly this: fair pricing, and not charging for work that is not needed. That promise is the reason a worried owner facing a scary quote can book here with confidence.

We photograph the work and send you the images. So you can see what we found rather than taking it on faith. And all work is fully guaranteed, with a 12-month or 20,000km driveline warranty.

See our 302 Google reviews.

Vehicles and gearboxes we repair

Manual and automatic gearboxes across passenger cars, 4WDs, utes and light commercials - every make, every model. As southern Adelaide's diesel and 4WD workshop, we see plenty of the hard-working utes and wagons our customers drive: the Ranger, Hilux, D-Max, Triton, Navara and LandCruiser, where towing and touring put real load through the gearbox.

For automatics, a lock-up or shift-quality complaint is sometimes solved more cheaply than a repair. A transmission service (fresh fluid and filter) prevents many failures, and a Stocklock lock-up kit fixes the converter shudder and economy complaints that owners often assume are a rebuild. Drive a Ford, Toyota or Nissan? Our Ford, Toyota and Nissan mechanic pages cover the brand detail, and it all sits under our transmission and gearbox work.

Gearbox repair on a 4WD ute at Trusted Mechanical, southern Adelaide

Gearbox repair costs and how to start

Gearbox repair cost varies widely. A clutch, seal or solenoid is a modest job, while a full rebuild or an exchange unit is a larger one, so the only fair number is one based on a proper diagnosis of your vehicle. Any workshop that quotes a gearbox repair before seeing your car is guessing.

So we do it the honest way. Book it in or call, we diagnose the fault, then you get clear options and prices before any work starts, backed by the RAA fair-pricing promise that we will not charge for work you do not need. A free loan car is available while we have your vehicle, so a day in the workshop is not a day off the road, and all work is guaranteed.

Gearbox repair FAQs

Only a proper diagnosis tells you. Many noises and shifting faults are a contained repair (a clutch, bearing, synchro or solenoid), not a rebuild. We diagnose the fault first and give you the options with prices before any work starts.

Still have a question? Call us on 08 8186 2005 or book your gearbox in online.

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Get an honest diagnosis on your gearbox

RAA Approved Repairer · all work guaranteed · we photograph your service · free loan cars · 31 Aldenhoven Road, Lonsdale SA 5160 · Mon-Fri 8:30AM-5:00PM

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