The Jatco 3N71B 3-speed automatic transmission was produced in Japan from 1968 to 1993 and installed in rear- and all-wheel-drive Nissan and Mazda models, including the L3N71B version. With the addition of an overdrive gear, the transmission became the 4-speed 4N71B.
Specifications
| Type | automatic transmission |
| Number of gears | 3 |
| Type of drive | rear / all wheel |
| Engine volume, l | up to 3.0 |
| Torque output, Nm | up to 250 |
| Recommended oil | Dexron III |
| Oil capacity, liter | 5.5 |
| Partial replacement, liter | 3.5 |
| Maintenance | every 80 000 km |
| Gearbox lifespan, km | ~300 000 km |
Gear ratios Jatco 3N71B
Using the example of a 1982 Nissan Cedric with a 2.0 liter engine:
| Main | 4.625 |
| 1st | 2.458 |
| 2nd | 1.458 |
| 3rd | 1.000 |
| Reverse | 2.182 |
Using
The transmission was installed on:
- Mazda 626 I (CB) in 1978 – 1982; 626 II (GC) in 1982 – 1987;
- Mazda 929 I (LA) in 1972 – 1981; 929 II (HB) in 1981 – 1986;
- Mazda B-series III (UC) in 1977 – 1985; B-series IV (UF) in 1985 – 1993;
- Mazda Cosmo II (CD) in 1975 – 1981; Cosmo III (HB) in 1981 – 1989;
- Mazda RX-7 I (SA) in 1978 – 1985;
- Mazda Roadpacer I (AP) in 1975 – 1977;
- Nissan Cedric 2 (130) in 1968 – 1971; Cedric 3 (230) in 1971 – 1975; Cedric 4 (330) in 1975 – 1979; Cedric 5 (430) in 1979 – 1983;
- Nissan Fairlady Z 1 (S30) in 1971 – 1978; Fairlady Z 2 (S130) in 1978 – 1983;
- Nissan Gloria 4 (230) in 1971 – 1975; Gloria 5 (330) in 1975 – 1979; Gloria 6 (430) in 1979 – 1983;
- Nissan Hardbody 1 (D21) in 1985 – 1993;
- Nissan Laurel 1 (C30) in 1968 – 1972; Laurel 2 (C130) in 1972 – 1977; Laurel 3 (C230) in 1977 – 1980; Laurel 4 (C31) in 1980 – 1983;
- Nissan Silvia 2 (S10) in 1975 – 1979; Silvia 3 (S11) in 1979 – 1983;
- Nissan Pathfinder 1 (WD21) in 1985 – 1987;
- Nissan Terrano 1 (WD21) in 1985 – 1987;
- Nissan Maxima 1 (G910) in 1980 – 1983.
Disadvantages of the Jatco 3N71B gearbox
- This is a fairly reliable transmission, and all its breakdowns are due to age and infrequent oil changes;
- The main problem is finding a service center that will repair this automatic transmission;
- There are also issues with finding spare parts, but many can be found in other transmissions;
- It’s good that clutch and seal kits are still available for order;
- It’s also worth noting that there are almost no good donors left in the scrap yard.
