Also known as: aw-4, aw4, 30-40le, a340e jeep, jeep 4-speed automatic
Aisin's four-speed automatic for Jeep — in the Cherokee XJ and the Grand Cherokee ZJ and WJ.
It is a Toyota A340E in a Jeep, which is most of what is worth knowing: the same transmission GM bought as the 30-40LE and Toyota fitted to the Supra. So a Cherokee's automatic has a service literature spanning three companies, and none of them mentions the others.
Its reputation is excellent and that changes what a symptom means. These reach very high mileages, so a slip or a harsh change on one is far more often the fluid, the throttle position sensor or the transmission control module's own connector than a worn clutch pack.
The TPS is the one worth naming, because on this transmission it does more than report load: a drifting sensor makes the gearbox change at the wrong road speed or hunt between third and fourth, and it is an engine-bay part regularly replaced as a transmission fault.
Fluid is Dexron, and these predate sealed-for-life entirely — the interval was specified and is simply often skipped.
Cars fitted with this gearbox
2 generations. Only where a source names the model and the generation together — a gearbox is documented as a product far more often than as a fitment, so this list is deliberately shorter than the truth.
Information, not instruction
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