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Starting at $16.95, AutoBuffy stocks 4 automatic transmission speed sensors from SKP, VEMO, and Delphi. This sensor monitors shaft rotation speed and sends real-time data to the transmission control module, allowing precise shift timing. When it fails, the TCM loses that signal, causing erratic shifts, incorrect speedometer readings, and potential limp mode — problems that worsen quickly if ignored.
Most automatic transmissions use one or two speed sensors — an input shaft sensor (turbine speed sensor) and an output shaft sensor — and they are not interchangeable, so confirm which position you need before ordering. Beyond position, the key decision is between OE-equivalent sensors that restore factory signal accuracy and performance-oriented sensors designed for modified powertrains. Brand quality matters here because a sensor with loose tolerances produces noisy signal data that causes the same erratic shift behavior you are trying to fix.
| Option | Best for | What you get |
|---|---|---|
| OE-Equivalent Output Speed Sensor | Daily drivers needing a reliable factory-spec fix | Matches original reluctor ring tooth count, plug-and-play fitment, restores speedometer and shift points accurately |
| OE-Equivalent Input (Turbine) Speed Sensor | Vehicles with shift timing or torque converter complaints | Monitors input shaft RPM for lock-up clutch control; critical for smooth converter engagement and fuel economy |
| OEM / Dealership-Grade Sensor | High-mileage vehicles still under powertrain warranty or where exact factory specs are required | Sourced from the original supplier, guaranteed fit, highest cost but zero calibration concerns |
| Performance / Heavy-Duty Sensor | Towing builds, performance-tuned transmissions, or frequent trailer hauling | Reinforced housing, higher heat tolerance, designed for elevated ATF temperatures and modified shift programming |
Most transmission speed sensors thread directly into the transmission case or tail housing and are secured by a single bolt or twist-lock connector, making them accessible without lifting the transmission. Before starting, use a scanner to confirm which sensor is at fault, then disconnect the electrical connector, remove the retaining bolt, and pull the sensor straight out. Install the new sensor, snug the retaining bolt firmly without overtightening, reconnect the harness, and clear all stored codes before test-driving to confirm normal shift behavior.