- Quick correction and what that means for the job
- The NV3550 manual gearbox does NOT have a camshaft position sensor. Camshaft (and crankshaft) position sensors are engine sensors mounted on the cylinder head or bellhousing area of the engine, not on the transmission.
- The NV3550 gearbox commonly has an output/vehicle speed sensor (VSS) and gear/neutral/reverse switches. If you intended to work on a sensor at the NV3550, you almost certainly mean the vehicle speed sensor (output speed sensor) or the neutral/reverse switch — the guide below covers the VSS (most common replacement) and notes about the engine camshaft sensor if you actually meant the engine.

- Safety first
- Wear safety glasses and gloves to protect eyes and hands.
- Use wheel chocks and jack stands — do not rely on a jack alone.
- Work on a flat, level surface and keep a drain pan for any fluid drips.

- Tools (detailed descriptions and how to use each)
- Ratchet (3/8" drive recommended)
- Description: Hand tool with a reversible mechanism to turn sockets quickly.
- How to use: Fit the correct socket onto the square drive, set the direction lever, and pull/push the handle to loosen/tighten fasteners.
- Metric socket set (commonly 8mm, 10mm, 13mm)
- Description: Collection of sockets sized for metric bolts/nuts.
- How to use: Choose the socket that fits snugly on the bolt head; use with the ratchet and an extension if the bolt is recessed.
- Socket extension(s)
- Description: Short metal bars that extend reach of the ratchet.
- How to use: Insert extension between ratchet and socket to reach sensors tucked into the tailhousing.
- Combination wrenches (metric set, same sizes as sockets)
- Description: Open and boxed-end wrenches for places a ratchet can’t reach.
- How to use: Box end for best grip on nut; open end for quick access in tight spots.
- Flathead screwdriver
- Description: Straight-blade screwdriver.
- How to use: Pry plastic clips, release connector tangs, or leverage stuck connectors gently.
- Penetrating oil (PB Blaster or Liquid Wrench)
- Description: Lubricant that loosens rusted/ seized fasteners.
- How to use: Spray on bolt threads, wait 10–15 minutes, then attempt removal.
- Multimeter (digital)
- Description: Measures voltage, resistance, and sometimes frequency/AC.
- How to use: Set to DC volts or resistance to test wiring and basic sensor outputs; follow the step instructions below.
- Electrical contact cleaner
- Description: Cleaner to remove corrosion/grease from connectors.
- How to use: Spray into electrical connectors after unplugging; allow to dry before reconnecting.
- Small wire brush or pick
- Description: Clean corrosion from connector pins or sensor seat.
- How to use: Gently clean contacts and sensor mating surface.
- Small flashlight or work light
- Description: Illuminates dark areas under vehicle.
- How to use: Position to give clear light into the bellhousing/tailshaft area.
- Jack and jack stands
- Description: Hydraulic jack to lift vehicle and stands to safely hold it up.
- How to use: Lift vehicle with the jack only to place jack stands under recommended lift points, lower onto stands, then remove jack.
- Wheel chocks
- Description: Blocks to stop wheels from rolling.
- How to use: Place behind and in front of wheels left on the ground.
- Replacement sensor (see parts section)
- Description: New vehicle speed sensor (VSS) or the correct engine cam sensor if replacing engine part.
- How to use: Install in reverse order of removal; use new O-ring/seal if included.
- Optional but recommended: impact driver or air ratchet, torque wrench
- Why optional: Impact speeds removal of seized fasteners; torque wrench ensures proper final tightness for sensor bolts.

- What you’ll likely be replacing and why
- Vehicle speed sensor (VSS) — why replace
- Symptoms: Speedometer not working, erratic speed reading, transmission shift problems (on automatics) or ABS/traction anomalies, or warning lights related to speed input.
- Reason: Sensor failure due to corrosion, wiring damage, internal electronics failure, or a damaged O-ring/gear causing leaks.
- Neutral/reverse switches — why replace
- Symptoms: Reverse lights not working or neutral switch related indicators.
- Reason: Failed switch or corroded connector.
- Camshaft position sensor (engine) — if that’s actually what you meant
- Symptoms: Hard starting, poor idle, misfires, engine warning lamp.
- Reason: Engine sensor failure or wiring damage.

- How to inspect and test the VSS (basic checks for a beginner)
- Visual inspection first
- Look for damaged wiring, corroded connector, or fluid leak at sensor.
- Clean connector with electrical cleaner and re-seat; check if problem temporarily resolves.
- Basic multimeter check (beginner-friendly)
- With key ON (engine off), backprobe the sensor connector signal pin and ground.
- If VSS is an active (Hall-effect) sensor, you may see ~5V reference on one pin; signal will vary when the shaft is spun. If unsure, just check for continuity to ground and for obvious open circuits.
- If you can safely spin the output shaft (with wheel removed and vehicle secured) and see pulsing voltage, the sensor is producing a signal.
- If you are unsure how to identify wires, skip electrical tests and move to replacement if symptoms and visual damage are clear.

- Removing and replacing the NV3550 vehicle speed sensor (step-by-step for a beginner)
- Prepare vehicle
- Chock wheels, set parking brake, raise vehicle with jack and secure on stands, verify stable.
- Locate the sensor
- Find the tailhousing of the NV3550 (rear of transmission where the output shaft is). The VSS is typically threaded into the tailhousing with a single bolt or is threaded directly into the tail housing.
- Use a flashlight; the sensor will have a wiring harness plugged into it.
- Disconnect electrical connector
- Depress the tab on the connector and pull straight off; use flathead screwdriver to release stubborn tabs if needed.
- Remove sensor fastener(s)
- Use the correct socket or wrench on the retaining bolt. Apply penetrating oil and wait if stubborn.
- Turn counterclockwise to loosen; use extension if recessed.
- Remove the sensor
- Pull straight out; wiggle gently if stuck. Note any O-ring or metal sleeve — keep or replace.
- Clean mating bore with rag; use small brush if needed but avoid pushing debris into gearbox.
- Install new sensor
- Compare new sensor to old for matching length and connector style.
- Lubricate new O-ring lightly with gear oil (if O-ring type). Insert sensor straight, then secure bolt to snug. If you have a torque wrench, torque to manufacturer spec (typically low torque for sensor bolt; if you don’t have a spec, snug it firmly without over-torquing).
- Reconnect electrical connector until it clicks.
- Test before reassembly
- Lower vehicle enough to spin wheel or drive briefly to check speedometer operation, or turn ignition on and check for signal with multimeter.
- Clean up
- Check for leaks, remove tools, lower vehicle from stands.

- If the camshaft position sensor (engine) is what you actually want
- General notes for a Wrangler TJ / similar Jeep engines
- Cam sensor location depends on engine year/type (e.g., 4.0L cam sensor on cylinder head near timing cover). Sensor is usually 1–2 bolts, with a single electrical connector.
- Tools: same basic hand tools, plus maybe a small socket/extension set and a ratchet; engine-specific access may require removing intake or airbox with a set of pliers/ratchet.
- Replacement: unplug connector, remove mounting bolt(s), replace sensor and reattach connector. Test by starting engine and checking for reduced symptoms or clearing codes.

- When replacement is required and what to buy
- Replace the sensor when:
- Visual damage/corrosion is present.
- Connector wiring is melted, cut, or corroded.
- Diagnostic checks show no signal or intermittent signal.
- Cleaning and reseating connectors do not restore proper operation.
- What to buy for NV3550 tailhousing
- Vehicle speed sensor (VSS) specific to Jeep model year and NV3550 gearbox — buy OEM Mopar part or a known aftermarket equivalent that lists fitment for your year/make/model and NV3550.
- Replace O-ring or seal if included with sensor — always use the new one.
- What to buy for camshaft sensor (engine)
- Camshaft position sensor listed for the specific engine code/year of your Wrangler; OE or quality aftermarket unit.
- Where to confirm fitment
- Use the vehicle VIN or engine code on parts sites or consult a dealer parts counter to confirm the exact sensor part number.

- Additional tips for a complete beginner (no nonsense)
- If connector is corroded, cleaning it often fixes an intermittent problem — try that first.
- Keep hardware and old sensor until you’ve verified the new sensor works.
- Take photos before unplugging connectors so you can reconnect correctly.
- If bolts are heavily corroded or rounded, you may need an extractor set or penetrating oil plus patience.
- If you do not feel comfortable under the vehicle or near moving parts, consider a shop to avoid injury.

- Final practical summary (what you will likely need to do)
- If you meant NV3550 gearbox sensor: inspect wiring/connector, test signal if possible, replace the VSS (common fix).
- If you actually meant camshaft position sensor on the engine: remove engine intake/accessory as needed, unplug and swap sensor, verify operation.
- Tools: basic metric socket/ratchet set, extension, screwdriver, penetrating oil, multimeter, jack stands, contact cleaner. Optional: torque wrench, impact tools, extractor set.

- Parts recommendation (generic)
- Buy the specific VSS for NV3550 for your Wrangler year — OEM Mopar or quality aftermarket brand (Dorman, Standard Motor Products, NTK). Ensure the listing specifies NV3550 or your Jeep year/model/engine.
- For an engine cam sensor, buy the sensor specifying your engine code/year; OEM or reputable aftermarket brands.

- Troubleshooting if replacement does not fix it
- Check wiring continuity and grounds from the sensor connector to the ECU/cluster.
- Check the instrument cluster or ECU codes — sensor replacement won’t help if cluster or wiring is bad.
- If electrical testing is beyond comfort, take the car to a shop with your new sensor and the old one for a quick bench test/diagnosis.

No extra questions.
rteeqp73

1999-04 Jeep Wrangler TJ - B&M Manual SportShifter 45048 for NV3550 Transmission 1999-04 Jeep Wrangler TJ - B&M Manual SportShifter 45048 for NV3550 Transmission. Please subscribe to our YouTube ...

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