Installation And Ergonomic Review Of Nismo Shift Knobs In A 240sx

So, you're thinking about upgrading the shift knob in your 240SX? Excellent choice! A Nismo shift knob can be a fantastic way to improve the feel of your gear changes and add a touch of JDM style to your interior. But like any modification, the installation can sometimes present a few hurdles. This article will walk you through the installation process, highlight common ergonomic considerations, and offer solutions to potential problems you might encounter.

Installation: A Step-by-Step Guide

Before we dive in, let's gather the necessary tools. You'll need:

A new Nismo shift knob (obviously!). Make sure it's compatible with your 240SX's thread pitch. Most 240SX's use a 10x1.25mm thread.
A set of pliers or vise grips (protected with a rag or tape to avoid scratching).
A wrench or adjustable spanner (size will depend on the retaining nut, if applicable).
Penetrating oil (like PB Blaster or WD-40). This can be crucial!
Possibly a small flathead screwdriver.
Protective gloves.

Removing the Old Shift Knob

This is often the trickiest part. Many 240SX shift knobs have been in place for years and are notoriously stubborn. Here's a breakdown of the removal process:

Assess the situation: First, try simply unscrewing the old shift knob by hand. Rotate it counter-clockwise. If it comes off easily, great! You can skip ahead to the installation section.
Penetrating Oil is Your Friend: If the knob is stuck, liberally spray penetrating oil around the base of the knob where it meets the shifter shaft. Let it soak for at least 15-20 minutes, or even longer if possible. Reapply the oil periodically.
The Pliers/Vise Grips Method: (Use with Caution!) If the knob still won't budge, you can try using pliers or vise grips. Wrap the shift knob completely in a thick rag or several layers of tape to protect its surface from scratches. Gently clamp the pliers/vise grips onto the wrapped knob. Apply steady, even pressure while turning counter-clockwise. Be extremely careful not to crush the knob or damage the shifter shaft.
The Retaining Nut: Some aftermarket shift knobs have a retaining nut at the base that secures them to the shifter shaft. Use a wrench or adjustable spanner to loosen this nut before attempting to unscrew the knob. Turning the nut towards the shift knob base should loosen it.
Persistence is Key: If the knob is extremely stuck, repeat the penetrating oil application and pliers/vise grips method several times. Don't get discouraged!
Last Resort (Destructive Removal): If all else fails, you may have to resort to more destructive methods. This should only be done if you're absolutely sure the old knob is going in the trash. You could carefully cut the knob off with a hacksaw or Dremel tool, but be extremely careful not to damage the shifter shaft threads. Seriously, proceed with extreme caution if you choose this route.

Important Note: Be patient and avoid using excessive force. Stripping the threads on the shifter shaft can be a costly repair.

Installing the Nismo Shift Knob

Once the old knob is off, the installation process is usually straightforward:

Clean the Shifter Shaft: Use a clean rag to wipe down the shifter shaft threads, removing any old adhesive or debris.
Thread the Knob: Carefully thread the Nismo shift knob onto the shifter shaft, turning it clockwise.
Tighten Securely: Tighten the knob until it's snug and properly aligned. Don't overtighten, as this can damage the threads.
Adjust Retaining Nut (if applicable): If your Nismo shift knob has a retaining nut, adjust it so that the knob sits at the desired height and orientation. Tighten the nut against the base of the knob to secure it.

That's it! You've successfully installed your new Nismo shift knob.

Ergonomic Considerations and Solutions

While a Nismo shift knob looks great, it's important to consider the ergonomics. The shape, size, and weight of the knob can significantly affect your driving experience.

Knob Shape and Size

Nismo offers shift knobs in various shapes and sizes, including round, teardrop, and cylindrical. The best choice for you depends on your personal preference and driving style.

Round Knobs: Provide a comfortable and natural grip. They're often preferred for daily driving and smooth shifting.
Teardrop Knobs: Can offer a more precise feel and may be better for aggressive driving. The angled shape allows for a more secure grip during quick shifts.
Cylindrical Knobs: Offer a minimalist aesthetic and a direct feel. Some drivers find them less comfortable for extended use.

Solution: If you're unsure which shape is best for you, try holding different types of knobs to get a feel for them. You might even visit a local car meet or ask friends if you can try out their shift knobs.

Knob Weight

The weight of the shift knob can also affect the feel of your shifts. Heavier knobs can provide a more solid and precise feel, while lighter knobs can make shifting feel quicker and more responsive.

Heavier Knobs: Can help reduce notchiness and improve the smoothness of shifts. They can also make it easier to find gears.
Lighter Knobs: Can make shifting feel more direct and immediate. They can also reduce the effort required to shift gears.

Solution: Experiment with different weight knobs to find what works best for you. If you have a notchy transmission, a heavier knob might be a good choice. If you prefer a more responsive feel, a lighter knob might be better.

Knob Height

The height of the shift knob can affect your reach and comfort. A shorter knob will bring your hand closer to the steering wheel, while a taller knob will require you to reach further.

Solution: If you find yourself reaching too far for the shift knob, a shorter knob might be a better option. Conversely, if you prefer a more relaxed driving position, a taller knob might be more comfortable.

Temperature Issues

Metal shift knobs can get extremely hot in the summer and extremely cold in the winter. This can make them uncomfortable to use.

Solution: Consider using a shift knob cover or choosing a shift knob made from a non-conductive material like Delrin or plastic. You can also park in the shade or use a sunshade to help keep your car cool in the summer.

Troubleshooting Common Problems

Even with careful installation, you might encounter a few problems:

The new knob won't thread onto the shifter shaft: Double-check that the thread pitch of the knob matches the thread pitch of the shifter shaft. If they don't match, you'll need to purchase a knob with the correct thread pitch or use a thread adapter.
The knob is loose or wobbly: Make sure the knob is tightened securely. If it's still loose, you may need to use a thread locker like Loctite (blue, not red!) to keep it from coming loose. A small amount will suffice.
The shift pattern isn't aligned correctly: If the shift pattern on the knob is not aligned correctly, you can usually adjust it by loosening the retaining nut (if applicable) and rotating the knob until it's properly aligned.
Vibrations: Sometimes a new shift knob, especially a heavier one, can transmit more vibrations from the transmission to your hand. This is usually normal, but if it's excessive, you might want to try a shift knob with a rubber or foam core to dampen the vibrations.

Estimated Repair Costs

The cost of installing a Nismo shift knob is relatively low. The knob itself can range from $50 to $150, depending on the model and material. If you're doing the installation yourself, you'll only need to factor in the cost of tools and supplies, which should be less than $20.

If you're having a professional install the knob, labor costs will vary depending on the shop. However, the installation is usually quick and easy, so labor costs should be minimal, probably around $30-$50. The biggest potential cost comes from damaging the shifter shaft during removal of the old knob. Replacing a stripped or damaged shifter shaft can range from $100-$300 including parts and labor.

By following these tips and troubleshooting steps, you can successfully install a Nismo shift knob in your 240SX and enjoy the improved feel and style it provides. Remember to prioritize patience and caution, especially during the removal of the old knob, to avoid any costly repairs. Happy shifting!