The Fiat Fullback gearbox takes a serious beating given this pick-up's off-road credentials. Powered by a 2.4-litre aluminium diesel engine available in two outputs — 154 and 181 bhp — the Fullback is built for toughness as much as performance. Its 6-speed transmission, short gearbox, 21 cm ground clearance and long-travel suspension make it perfectly at home on demanding terrain, where its centre differential lock — and rear differential lock on top-spec models — comes into its own.
Designed to optimise both driving dynamics and payload capacity, the Fiat Fullback gearbox can nonetheless show signs of wear despite regular servicing. In this guide, EDEN BOITES runs through the tell-tale symptoms of a failing transmission, the key steps involved in stripping it down, and the repair solutions best suited to this rugged pick-up.
Warning signs of a gearbox fault on the Fiat Fullback
The Fiat Fullback features four-wheel drive — selectable on lower trim levels and permanent on higher ones — paired with either a 6-speed manual or a 5-speed automatic gearbox. Built primarily for professional use, it is engineered to climb, tackle rough ground and carry heavy loads. Regardless of the variant, several symptoms point to a failing Fiat Fullback gearbox.
If your vehicle has a manual gearbox, pay attention when:
- A continuous droning noise can be heard;
- The gear lever refuses to engage one or more positions;
- Crunching accompanies gear changes;
- Engaging gears becomes difficult;
- Gears jump out whilst driving;
- The transmission becomes particularly noisy;
- Oil leaks appear beneath the casing.
With an automatic gearbox, stay alert if gear changes are delayed or erratic, if unusual noises occur, if a strange smell is noticeable during gear changes, or if you spot transmission fluid stains under the vehicle.
Repair: the steps involved in stripping the gearbox
Repairing a gearbox is a complex process. For reasons of quality and expertise, calling in a professional is usually the best course of action. Stripping the Fullback gearbox involves several key steps:
- Remove the retaining bolts from the rear extension of the casing;
- Withdraw the pinion by sliding it along its shaft;
- Remove the shaft locking bolt;
- Loosen a second bolt at the secondary shaft;
- Finally, extract the gearbox.
Beyond the specialist tooling required, this work demands an expert eye to determine the best course of action based on the symptoms observed.
Our top tips for repairing the Fiat Fullback gearbox
If gear changes feel erratic, check the adjustment of the selector rod and, if necessary, tighten the gearbox mount. If the gear linkage cable alone is at fault, simply replacing the three rods — easily located at the base of the engine — will suffice.
Unusual noises often indicate worn synchromesh sleeves or damaged gear teeth. Made from brass alloy, these rings are subjected to considerable stress and wear quickly. To replace them, once the gearbox has been removed, dismantle the synchromesh hub and slide it to disengage its ends; clean the balls and springs before fitting the new synchromesh unit.
If engaging a gear becomes difficult, it may be necessary to replace the clutch pressure plate, which can sometimes warp or become damaged. Finally, if oil leaks are present, check the gearbox filler plug: if it is properly fitted, a faulty seal or a crack may be the cause. A low lubricant level leads to jumping gears, abnormal noises and overheating — it is the most common cause of transmission problems, which is why regular oil changes are so important. To better understand the two technologies, see our guide on the differences between manual and automatic gearboxes.
Repair or replace the Fullback gearbox?
The diagnosis will point towards various courses of action depending on the problem: a simple adjustment, a targeted repair, or a complete replacement. In the latter case, EDEN BOITES can supply the right gearbox for your vehicle — such as the Fiat Fullback 2.4 CDI 4x4 6-speed manual gearbox — for your mechanic to fit. Browse all available references in our gearbox catalogue and in the Fiat collection. The Fullback is not the only Fiat van with a dedicated guide: also take a look at our advice on the Fiat Ducato gearbox and the Fiat Talento.
Frequently asked questions
How many gears does the Fiat Fullback gearbox have?
The pick-up comes with either a 6-speed manual or a 5-speed automatic gearbox, paired with selectable or permanent four-wheel drive depending on the trim level.
Is a continuous droning noise serious?
It frequently indicates worn bearings or synchromesh rings. It is best to have the noise diagnosed promptly to avoid more costly damage.
Can I repair my Fullback gearbox myself?
Some basic checks are within reach, but a full strip-down requires specialist tooling and professional expertise to ensure a reliable result.
Is an exchange gearbox suitable for intensive professional use?
Yes. Our reconditioned gearboxes are checked and tested to deliver the reliability demanded by a pick-up used day in, day out.
Why choose EDEN BOITES?
To get your Fiat Fullback gearbox back in top condition, EDEN BOITES offers checked and tested parts, delivered to your home or directly to your garage. Every exchange gearbox comes with a warranty of up to 24 months and a satisfaction-or-money-back guarantee in accordance with our Terms and Conditions. You can pay in instalments — in up to 10 instalments — and we deliver throughout France and the European Union, with a lead time confirmed on your quote. Browse the Fiat collection now and get your pick-up back on the road with complete peace of mind.
