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Home/Automatic Transmission Parts/CHRYSLER, DODGE, JEEP/ JR300H, 3N71B, L3N, JR400E, JR400H

JR300H, 3N71B, L3N, JR400E, JR400H

  • JATCO JR300H, 3N71B, L3N, JR400E and JR400H – a group of classic 3- and 4-speed hydromechanical automatic transmissions from the Japanese manufacturer JATCO, designed for vehicles with longitudinally mounted engines and rear-wheel drive (RWD). These transmissions were used in various passenger cars and commercial vehicles from Nissan/Datsun, Mazda, Ford, Mitsubishi and other manufacturers. Certain four-speed transmissions were also adapted for four-wheel drive (4WD) configurations.

    JR300H / 3N71B – a 3-speed automatic transmission introduced in 1971, with gear shifting controlled hydraulically according to engine load and vehicle speed. Later, the L3N71B (L3N) variant was developed with a hydrodynamic torque converter lock-up function, helping to reduce mechanical energy losses. These transmissions became the basis for the further development of JATCO longitudinally mounted automatic transmissions.

    JR400H is associated in professional transmission catalogues with the 4N71B, L4N71B and E4N71B family of four-speed transmissions. These versions feature an additional higher gear (overdrive), which allows engine speed to be reduced when driving at higher speeds. Individual variants differ in their level of hydraulic and electronic control. JR400E is also listed as a four-speed JATCO transmission, but its exact design relationship to the JR400H has not been unambiguously confirmed.

    These transmissions use a hydrodynamic torque converter, planetary gear sets, multi-plate clutches and a hydraulic control unit. Although some components and design solutions are related, transmissions of different generations and variants are not considered fully interchangeable.

  • Alternative and related designations:

    • JATCO (3-speed): JR300H, JR300-H.
    • Nissan / Datsun (3-speed): 3N71B, L3N71B, L3N; earlier related version – 3N71A.
    • JATCO (4-speed): JR400H, JR400-H; JR400E / JR400-E is listed separately in catalogues.
    • Nissan / Datsun (4-speed): 4N71B, L4N71B, E4N71B, L4N.
    • Mazda (related 4-speed versions): N4A-EL, N4A-HL.
    • Other related designations: JR401, JR401E – the identification of the specific unit must be verified.

    Vehicle model examples (various versions of this transmission group; application depends on year, engine, market and the specific transmission code):

    • Nissan / Datsun: 240Z (S30, 1971–1973), 260Z (S30, 1974–1978), 280Z (S30, 1975–1978), 280ZX (S130, 1978–1983), 200SX / Silvia (S10, S110, S12, certain automatic versions), 300ZX (Z31, 1983–1989), 240SX (S13, early versions), Skyline (R31, certain versions), Laurel (C130, C230, C31 and later corresponding versions), Cedric / Gloria (230, 330, 430), 510 / Bluebird, 610 / 180B, 710, 810 / Maxima, Sunny / 210 (B210, B310), Pick Up (620, 720, D21), Pathfinder / Terrano (WD21, early 4-speed versions), Caravan / Urvan and Vanette (certain automatic versions).
    • Mazda: 616, 618, 626 (early generations), 808 / 818, 929 (early and HC generation versions), RX-2, RX-3, RX-4, RX-7 (SA/FB and FC, certain automatic versions), MX-5 / Miata (NA, certain automatic versions), B-Series (B1600, B1800, B2000, B2200, B2600), MPV (LV, 2.6 l, certain versions), Cosmo.
    • Ford: Courier (1973–1983, certain automatic versions); Ranger (approx. 2000–2006, 2.5 l, JR400E is listed in some application catalogues, the exact unit must be verified).
    • Mitsubishi: Starion (approx. 1983–1989, certain 4-speed automatic versions).
    • Chrysler / Dodge / Plymouth: Conquest (1984–1989, US market versions with Mitsubishi-based technology).
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