Jatco RE7R01B

Jatco's longitudinal seven-speed for Nissan and Infiniti — in the Patrol Y62, QX80, Pathfinder, Navara and the Infiniti FX.

It replaced the RE5R05A and it fixed that gearbox's worst characteristic: the cooler arrangement that let engine coolant into the transmission fluid. So the failure that dominates the five-speed is not this transmission's failure, and advice about one should not be applied to the other despite the shared vehicles and overlapping years.

Its own recurring theme is the valve body and its solenoids, presenting as a harsh or delayed engagement into drive, a jerk on the 1–2 change, or a limp mode. It is often preceded by nothing at all, which is why fluid condition is worth knowing before the first symptom rather than after.

Nissan's Matic-S fluid is specific and the interval is real. These were sold with long or unstated service intervals, and a unit at 150,000 km on its original fill is the commonest version of every complaint above.

A shudder at light throttle is the lock-up clutch, not slipping — the same distinction, and the same first remedy, as everywhere else in this catalogue.