The Nissan Frontier and Pathfinder split across two transmission types depending on generation, and the failure modes are completely different between them. Getting oriented on which unit you're looking at before starting diagnosis saves significant time. Here's the breakdown. RE5R05A 5-speed automatic (Frontier 2005–2019, Pathfinder 2005–2012, 4.0L VQ40DE): The RE5R05A is a Jatco-built unit and it's generally considered a durable transmission — when it's maintained. The failure pattern that brings these into shops most often is the torque converter clutch. The TCC apply piston wears and the friction material glazes, causing shudder at 40–55 mph under light throttle. This is frequently the first symptom, and it escalates to full slip if not addressed. The second common failure is the line pressure control solenoid — Jatco calls it the pressure control solenoid A (PCS-A) — which sticks and causes low line pressure across multiple ranges. On high-mileage units above 150,000 miles, front planetary bearing wear shows up as a whine or growl that changes with gear selection.
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ATSG RE5R05A Transmission Rebuild Manual
Complete teardown reference for the Jatco RE5R05A — clutch pack counts, end-play specs, and valve body diagrams all in one place.
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