GearboxesLast updated: 18 June 2012 The L322 was automatic only: no manual was ever offered. Over its life it used four different autos, and the difference matters: the early 5-speeds are the weak link, while the later ZF 6- and 8-speeds are far more solid. [ ▲ ] Photo: ZF automatic gearbox add image here Key takeaway: All L322s are automatic. The ZF boxes are strong if serviced; ignore 'sealed for life' and change the fluid. A failed box is one of the costliest repairs.
Which gearbox is in which car?
NOTE
Sources vary on the early petrol box: many list the BMW 4.4 with the ZF 5HP24, while the
Td6 diesel used the GM 5L40-E. Both are 5-speeds and both are the cars' weak point.
The early 5-speeds (2002-2006)The 5-speed autos are the most failure-prone part of the early L322. Symptoms: reluctance to shift, gear-monitor or engine-management warnings, then a chattering noise under load. If that happens, stop driving and recover the car: continuing can destroy the box. ZF 6HP26 / 6HP28 (2006-2012)The ZF 6-speed transformed durability. A well-maintained 6HP26/28 can exceed 250,000-300,000 km without a rebuild. The most common issue is a selector / position fault (the car doesn't "see" Park and won't start), often a repairable position sensor rather than a rebuild. It is very sensitive to low voltage — a weak battery or poor earths can trigger misleading transmission faults. Fluid: ZF Lifeguard 6. ZF 8HP70 (2011-2012)The eight-speed on the 4.4 TDV8 is typically even more robust; failures are rare and usually linked to hard use plus neglected fluid. Fluid: ZF Lifeguard 8 (not interchangeable with Lifeguard 6). Faults & care
WATCH OUT
Before condemning a ZF6 mechatronic unit, always check battery condition and earth straps
. Sub-12V supply can create the same symptoms as a failing gearbox.
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