Automatic Shift Knob Adaptor Buying Guide: Fit Auto Gearboxes

Quick answer

Buy an automatic shift knob adaptor that matches your factory lockout style and shifter assembly, not just your knob thread. For most Subaru CVT owners, the Billetworkz CVT adapter is the direct fit; Chevy SS 2014-2017 owners need the model-specific Billetworkz adapter. If you only want a visual change, a Shift Knob Hoodie is the simpler, cheaper route.

Swapping a shift knob on an automatic is not the same as on a manual. Most factory auto knobs include a lockout button or a pull-up mechanism that lets you move the selector out of Park, and that mechanism has to keep working after the swap. An automatic shift knob adaptor is the part that replaces the factory button with a fixed-position lockout system so an aftermarket knob can mount cleanly.

This guide covers the two main adaptor types we stock, what to measure before ordering, and when a hoodie or a different approach makes more sense. It is written for drivers doing real-world fitment, not for show cars that never leave the garage.

What an automatic adaptor actually replaces

On a manual transmission, the shift knob usually threads onto the lever or clamps with set screws. On an automatic, the knob is often integrated with the lockout button or the pull-up collar. That means a standard threaded knob will not simply screw on. The adaptor replaces the factory button with a spring-loaded or fixed-position lockout, giving you a stable mounting point for the new knob.

The practical difference between designs matters. A spring-loaded pull-up lockout keeps a moving mechanism, while a fixed-position lockout removes the button action entirely. Both can work, but they feel different and suit different drivers. The Billetworkz CVT adapter uses a spring-loaded pull-up lockout system, while the Chevy SS adapter uses a fixed-position lockout. Neither is universally better; it depends on your shifter and how you use the car.

• Check whether your factory shifter uses a button, a pull-up collar, or a side-mounted lockout before ordering.
• If your car is not listed in the product title, do not assume the adaptor fits; measure or contact the seller first.

How to check fitment before you buy

Start with the vehicle year, model, and transmission type. The Billetworkz CVT adapter covers Subaru WRX 2015-2021, Crosstrek 2013-2023, Forester 2014-2018, Impreza 2012-2023, and Legacy/Outback 2010-2014 with CVT. The Chevy SS adapter covers 2014-2017 automatic cars. If your car falls outside those ranges, the adaptor is not a confirmed fit and you should not order it on the assumption that it will work.

Next, confirm the lockout type. A pull-up lockout and a press-down lockout are not interchangeable, and the product descriptions call this out. The CVT adapter is designed around a pull-up system, while the Chevy SS adapter uses a fixed-position system. If your factory shifter uses a different action, the adaptor may not operate correctly even if the threads match.

• Write down your exact model year and transmission code before shopping.
• Photograph your factory shifter and lockout before ordering so you can compare it to product photos.

Adaptor sizing and thread pitch: what to confirm

Adaptor sizing is about two things: the connection to the shifter assembly and the connection to the new knob. The adaptor must seat correctly on the shifter, and the knob must thread or mount onto the adaptor. If either side is wrong, the install will not be clean. The product listings here do not publish thread pitch for every adaptor, so if you already own a knob, verify its thread before ordering.

If you are buying a knob and adaptor together, match them as a pair. Mixing a knob from one brand with an adaptor from another can work, but only when the threads and lockout style line up. When in doubt, choose a known pairing or ask before you buy. This is one area where guessing costs more than measuring.

• Measure your factory shifter diameter and note the lockout style.
• If the listing does not state a thread pitch, treat that as an unknown and confirm it before purchase.

When a hoodie is the better choice

Not every automatic owner wants to disassemble the shifter. If your goal is comfort or a quick visual change, a Shift Knob Hoodie covers the knob without touching the lockout mechanism. It protects your hand from a hot knob in summer and a cold one in winter, and it changes the interior look in seconds. That is a different job than an adaptor, and it is worth being honest about which one you actually want.

The tradeoff is that a hoodie does not let you mount an aftermarket knob and does not change the shifter feel. It is a cover, not a mounting solution. If you want a weighted knob, a different shape, or a specific material, you need an adaptor. If you want a cheap, reversible change, the hoodie wins on simplicity.

• Choose a hoodie if you want comfort and style without disassembly.
• Choose an adaptor if you want to mount a specific aftermarket knob.

Decision rules for choosing an automatic adaptor

• Match the lockout type first: Identify whether your factory shifter uses a pull-up lockout, a press-down button, or a fixed-position mechanism. The CVT adapter is built around a pull-up system; the Chevy SS adapter uses a fixed-position system. If the lockout action does not match, do not buy the adaptor even if the vehicle is listed.
• Confirm your exact vehicle coverage: Check the year and model ranges in the product title. The CVT adapter covers specific Subaru models from 2010-2023; the Chevy SS adapter covers 2014-2017 only. If your car is outside the listed range, treat it as unsupported until confirmed.
• Decide between a knob mount and a cover: An adaptor lets you install an aftermarket knob and changes the shifter feel. A hoodie covers the existing knob for comfort and style without disassembly. Pick the adaptor for a real knob swap; pick the hoodie for a quick, reversible change.

Product facts that affect your decision

• Billetworkz Automatic CVT Shift Knob Adapter – Subaru CVT: WRX (15–21), Crosstrek (13–23), Forester (14–18), Impreza (12–23), Legacy/Outback (10–14): Precision CNC-machined aluminum adapter that replaces the factory shift knob button with a spring-loaded pull-up lockout system, with a fixed-position design rather than lifting or pressing the entire knob. If your Subaru CVT uses a pull-up lockout, this is the direct-fit option and keeps the lockout action familiar instead of forcing a press-down motion.
• Billetworkz Automatic Shift Knob Adapter - Chevy SS 2014-2017: CNC-machined aluminum adapter for the 2014-2017 automatic Chevrolet SS that replaces the factory shift knob button with a fixed-position lockout system. Chevy SS owners get a model-specific fit with a fixed lockout, which is cleaner and more stable than adapting a universal part.
• Shift Knob Hoodie - Life Hearts: A stretch cover for the shift knob available in a wide array of colors and patterns, designed to protect your hand from a hot or cold knob and change the interior look in seconds. A low-cost, no-disassembly alternative when you want comfort or a quick style change rather than a new knob.

Best for and not for

Best for

• Subaru CVT owners within the listed year ranges who want to mount an aftermarket shift knob and keep a pull-up lockout.
• Chevy SS 2014-2017 automatic owners who want a fixed-position lockout and a clean knob mount.

Not for

• Drivers whose factory shifter uses a lockout action that does not match the adaptor design.
• Owners of vehicles outside the listed year and model ranges who need a confirmed fit.
• Anyone who only wants a visual or comfort change without disassembly; a Shift Knob Hoodie is the simpler choice.

An automatic shift knob adaptor is a fitment part, not a universal accessory. Match the lockout type and vehicle coverage first, confirm sizing second, and only then choose between an adaptor and a hoodie. That order saves returns and frustration.