BMW 7 Series gearbox maintenance tips

If you want to maintain your BMW 7 Series at its best, it's important not to neglect its gearbox. EDEN BOITES reveals all its secrets!

How can I extend the life of my BMW 7 Series?

BMW 7 Series transmission features

Depending on the generation, the German brand equips its 7 Series with four types of engine: petrol, diesel, petrol-electric hybrid and diesel-electric hybrid.

Rear-wheel drive (only the vehicle's two rear wheels are driven) applies to most models, with the exception of sports versions which feature all-wheel drive: this is the case with the 750LI XDRIVE 530 EXCLUSIVE BVA8 and the 740D XDRIVE 320 M SPORT BVA8.

In this range, mechanical gearboxes quickly gave way to automatic transmissions. However, they are still found on the third-generation 728I PACK 13HP and the 725TDS 10HP.

The automatic gearbox is available from the first generation with the BMW 745i, and features four gears. On the 745 LE 17CV BVA8, it can be increased to eight gears, giving it a power output of 394 hp. 

Watch for signs of trouble

Here are the main signs of trouble you may encounter with your BMW 7 Series gearbox, and which you should be on the lookout for:

• Unusual noises may indicate worn bearings or excessive play between gearbox components such as the input shaft, thrust bearing guide or pinions;
• A burning smell: failure to drain the gearbox regularly, or leaks in the sump or SPI seals, can lead to premature deterioration of the entire transmission system;
• Difficulty in depressing the clutch pedal or engaging the gears on the gearshift lever indicates a clutch problem, poorly adjusted control cables or worn sycnhronizers;
• Unwanted clutch disengagement while driving may indicate a problem with the gearbox's internal locks;
• Sudden changes in engine speed for no apparent reason suggest that the transmission system is having difficulty managing gears correctly according to driving needs;
• A general drop in vehicle performance : slower acceleration and reduced top speed. 

If you have the slightest doubt about a fault in your transmission system, don't delay in consulting a mechanic. A problem that is not dealt with in good time can ultimately cause irreversible damage to your vehicle. Only a professional mechanic can make a reliable diagnosis.

How to repair a BMW 7 Series gearbox?

Replacing a manual gearbox

Replacing a manual gearbox requires solid knowledge and proven mechanical skills . It involves the following steps: 

• Gather all the tools necessary for this operation and make sure to secure the car on level ground;
• Place a container under the crankcase and drain the gearbox oil;
• To access the gearbox, remove the battery and battery holder, disconnect the control cables and remove the gearshift lever;
• Lift the car with a jack and hold it in an elevated position throughout the replacement process by placing the jackstands ;
• Unscrew the gearbox mounting bolts and use a transmission jack to support the gearbox until it is gently lowered;
• Place the new box on the jack, ensuring that it is firmly supported, and align it correctly with its housing;
• Tighten the fastening bolts and replace the components previously removed from the box;
• Fill with the transmission oil recommended for your model ( not to be confused with engine oil) and check the level with the dipstick; 
• Start the engine and drive for a few minutes to make sure the gearbox is working properly and shifting gears smoothly.

If you're not comfortable with this operation, don't hesitate to call on a qualified professional in this field for the assurance of a controlled installation.

Buying a new box

Is your mechanic's estimate beyond your budget? You don't have to buy your new BMW 740 F02 3.0 Turbo Petrol 4×4 transfer case as new, straight from the factory.

EDEN BOITES offers thousands of items at the best prices on the market in its online catalog. All our boxes are reconditioned by our specialized teams: they have undergone a series of checks after being conscientiously dismantled and cleaned. Defective parts have been replaced by quality ones. The result: the equivalent of a new box, but at second-hand prices!

To find the right gearbox for your vehicle, please check that your gearbox code matches the reference number of the product you've selected online: this will ensure compatibility. If you have any doubts or questions, our advisors are here to help!

And with our standard exchange delivery system, we'll even collect your used box for maximum peace of mind. If you'd like to spread out your expenses, we offer you the option of paying in three, four or even ten instalments, without delaying receipt of your box.

Request a quote online: it's quick and there's no obligation; or contact a EDEN BOITES advisor by phone right now for personalized support.