JR403E, RG4R01A
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JATCO JR403E / RG4R01A – a 4-speed hydromechanical automatic transmission developed by the Japanese manufacturer JATCO, documented in professional transmission catalogues since 1988. It is designed for vehicles with longitudinally mounted engines and rear-wheel drive (RWD), as well as for certain four-wheel-drive (4WD) variants. The transmission was mainly used in light and medium-duty commercial trucks from Isuzu, Chevrolet, GMC, Mitsubishi Fuso, Nissan Diesel (UD) and other manufacturers.
The JR403E design uses a hydrodynamic torque converter, planetary gear sets, multi-plate clutches, a brake band and a hydraulic gear shift system. The four-speed design with an overdrive gear makes it possible to combine the torque transfer required for commercial vehicles with lower engine speeds when driving at higher speeds. The transmission was produced in different variants, which may differ in housings, gear set components, hydraulic control units and output shaft design.
JR403E / RG4R01A is structurally related to other JATCO four-speed transmissions, including the RE4R03A, but professional repair catalogues list their components and repair kits separately. For this reason, a similar transmission layout or a shared spare parts catalogue is not sufficient proof of full compatibility.
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Alternative and related designations:
- JATCO: JR403E, JR403-E.
- Alternative transmission designation: RG4R01A.
- Professional parts catalogue designations: JR403, RMK.
- Related but separate transmission: RE4R03A – cannot be considered fully identical to the JR403E / RG4R01A model.
Vehicle model examples (only certain automatic versions; application depends on production year, engine, market and the specific transmission variant):
- Isuzu: NPR and NPR-HD (approx. 1988–1998, 3.9 l four-cylinder diesel engine, certain automatic versions).
- Chevrolet: W3500 Tiltmaster (approx. 1988–1998, four-cylinder diesel engine, certain automatic versions).
- GMC: W3500 Forward and W4500 Forward (approx. 1988–1998, four-cylinder diesel engines, certain automatic versions).
- Mitsubishi Fuso: Canter FE, FE-HD, FE-SP and FG (approx. 1988–1998, certain diesel automatic versions).
- Nissan Diesel / UD Trucks: UD 1200 and UD 1400 (approx. 1988–1998, certain diesel automatic versions).
- Mazda: Titan (approx. 1990–1997, certain 2-tonne class automatic trucks; the specific transmission code must be verified).
Important: JR403E / RG4R01A transmissions may have different hydraulic control units, friction and steel plate sets, brake bands, filters, torque converters, housings, output shafts and other components. Rear housings and output shafts of RWD and 4WD variants may differ. The JR403E must also not be automatically equated with the RE4R03A, RE4R01A or JR402E transmissions, although some of their parts may be shared. Before ordering spare parts, the vehicle's VIN, exact transmission code and original OE number must be checked.
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Check ballCode: A-CBL-68875Check ball. For various Jatco, Honda, Mercedes, VW/Audi models. For the valve body. 5,55 mm - 7/32"
Price 030 € VAT incl.
Automatic Transmission FilterCode: RE4.FIL01RE4R01A/R4A-EL, RE4R03A, JR403E , 4WD, NISSAN TERRANO II (R20) 98.07-, TERRANO (R50) 97.10-, PATROL GR (Y60,Y61) 91.10-, PATHFINDER (WD21) 90.01- NISSAN, 3.0 V6 MPV 93-99 MAZDA, 3.3 V6 QX4 INFINITI
Price 1236 € VAT incl.
