How to Install a Reverse Lockout Adapter on a Subaru
By Custom Shift Knobs & Interior Mods | Published: 2026-10-19
Category: How-to Guides
Learn to install a reverse lockout adapter on your Subaru in minutes. We cover fitment, tools, and common mistakes to avoid for a secure shift knob setup.
Quick Answer
Install a reverse lockout adapter on your Subaru by matching the adapter to your shift knob's thread size, threading it onto the shifter, then securing the knob. The whole job takes about five minutes with basic hand tools.
Why Fitment Matters More Than You Think
The reverse lockout adapter is a small piece, but its thread pitch and diameter must match both your shift knob and your shifter. Subaru models vary in thread size, and some shift knobs are designed to screw directly onto the shifter without an adapter. Check your knob's spec sheet before you buy.
If you already own a Billetworkz shift knob, the Billetworkz Reverse Lockout Adapter is engineered to work with it, so the fitment question is mostly about your Subaru's shifter thread. When in doubt, measure the thread diameter with a caliper or consult the product fitment options before ordering.
What You'll Need
Gather a clean rag, a thread-locking compound (optional but recommended), and a wrench or pliers with a soft jaw to avoid marring the adapter. You'll also need your new shift knob and the reverse lockout adapter itself.
Make sure the car is in neutral and the parking brake is engaged. This prevents the shifter from moving while you work and keeps the reverse lockout mechanism in a neutral position.
Installation Steps
- Remove the old shift knob: Twist the existing knob counterclockwise to unscrew it. If it's stuck, use a strap wrench or a soft-jaw pliers on the knob's base. Keep the shift boot and any retaining clips intact. Check that the shifter threads are clean and free of old thread-locker residue before proceeding.
- Clean the shifter threads: Wipe the exposed threads with a clean rag to remove dirt, grease, or old compound. This ensures the adapter threads on smoothly and seats fully. If threads look damaged, stop and inspect the shifter—forcing the adapter can strip it.
- Thread the reverse lockout adapter onto the shifter: Place the adapter over the shifter and turn it clockwise by hand until it stops. It should sit flush against the shift boot or the shifter base. Do not cross-thread it. If the adapter won't thread on easily, it's likely the wrong thread pitch—do not force it.
- Secure the adapter with thread-locking compound (optional): Apply a small drop of medium-strength thread-locker to the adapter's threads before final installation. This prevents loosening from vibration, especially if you track your car. Use sparingly—too much can make future removal difficult.
- Install the shift knob: Screw the shift knob onto the adapter clockwise until it's snug. Align any logo or engraving as desired. Tighten by hand, then use a wrench only if the knob has a hex base—avoid over-tightening. Test the reverse lockout by pulling up or pressing down as per your Subaru's design; the knob should move freely and return to neutral.
Product Fact
- Billetworkz Reverse Lockout Adapter: The Billetworkz Reverse Lockout Adapter is designed to integrate with various Billetworkz Shift Knobs. If you're using a Billetworkz knob, this adapter ensures a precise fit without guesswork, so the knob sits correctly and the reverse lockout function works as intended.
Billetworkz Reverse Lockout Adapter
