JR405E, RC4A-EL, UM700, UM711
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JATCO JR405E / RC4A-EL – a 4-speed hydromechanical automatic transmission developed by the Japanese manufacturer JATCO and introduced in the late 1990s. It is designed for vehicles with longitudinally mounted engines and rear-wheel drive (RWD) or four-wheel drive (4WD). The transmission was used in various Isuzu pickups and SUVs, Mazda passenger and commercial vehicles, and certain models from other manufacturers.
The JR405E design uses a hydrodynamic torque converter with lock-up function, two planetary gear sets, multi-plate clutches and brakes, and an electronically controlled hydraulic valve body. The transmission features a direct clutch pressure control system (DESC – Direct Electronic Shift Control), which regulates hydraulic pressure via solenoids and ensures smooth gear shifting. The electronic transmission control module (TCM) also uses adaptive shift control, taking into account engine load, vehicle speed and clutch engagement time.
Mazda RC4A-EL is a version of this JATCO transmission family, used, among others, in early Mazda RX-8 vehicles with a rotary engine. Although the JR405E and RC4A-EL share a common design, their clutch packs, steel plates, control components and other parts may differ depending on the specific application.
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Alternative and catalogue designations:
- JATCO: JR405E, JR405-E.
- Mazda: RC4A-EL, RC4AEL.
- Additional parts catalogue designations: UM700, UM711 – used within a common transmission parts group, but their exact correspondence must be verified against OE data.
Vehicle model examples (only certain automatic versions; application depends on production year, engine, market and transmission variant):
- Isuzu D-Max: first generation (from 2002, mostly until approx. 2011–2012), 3.0 l four-cylinder turbodiesel engine, certain RWD and 4WD automatic versions.
- Isuzu MU-7: 2004–2011, 3.0 l turbodiesel engine, certain automatic versions.
- Isuzu MU-X: 2013–2016, 3.0 l turbodiesel engine, certain 4WD versions with a four-speed automatic transmission.
- Isuzu Adventure Master / Grand Adventure: approx. 2000–2007, 3.0 l diesel engine, certain Thai-market automatic versions.
- Isuzu Space Cab: approx. 2000–2003, 3.0 l diesel engine, certain automatic versions.
- Mazda RX-8: first generation (SE / FE, 2003–2006, depending on market), 1.3 l RENESIS rotary engine, 4-speed automatic RC4A-EL version.
- Mazda Bongo / Bongo Friendee: certain automatic versions from approx. 1999–2011; the specific transmission code must be verified.
- Chevrolet / Holden Colorado: approx. 2004–2011, certain Asian and Australian market 2.8–3.0 l diesel RWD and 4WD versions. Does not automatically apply to all Colorado models.
Important: the JR405E and RC4A-EL belong to the same transmission family, but the Isuzu and Mazda variants are not fully identical. Friction and steel plate sets, hydraulic valve bodies, solenoids, filters, torque converters, housings, output shafts and electronic control components may differ. UM700 and UM711 are listed in some parts catalogues as related designations, but they should not be considered universal JR405E equivalents without additional confirmation. The transmission must also not be confused with the earlier JR402E / RE4R01A or other JATCO four-speed transmissions. Before ordering spare parts, the vehicle's VIN, exact transmission code and original OE number must be checked.
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Automatic Transmission FilterCode: JR405E.FIL01JR405E , RL4A-EL, ISUZU D-MAX I 4JH1-TC 05.02-06.12 ,CHEVROLET COLORADO 30 MM PICK UP
Price 1899 € VAT incl.
friction plateCode: SUB4.FRP07Friction plate LOW REVERSE 4EAT RC4AEL JR405E RE4R01A 04-up 147mm 30T 1.6mm 3153241X69 31662AA110 31662AA060 251704-160 075704-160
Price 682 € VAT incl.
