Anyone Swapped to a 6-Speed Miata Transmission? Need Insights!

Modifications & Upgrades
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Seeking Advice: 6-Speed Transmission Swap for Miata

Hey Miata enthusiasts!

I’m looking to upgrade my Miata’s transmission from the 5-speed to a 6-speed, and I could really use some guidance. I’ve been researching the topic but would love to hear from those who have made the swap themselves.

What I’m Curious About:

  • Performance Differences: How does the 6-speed compare to the 5-speed in terms of acceleration and responsiveness? Is there a noticeable difference on the track or during daily driving?
  • Ease of Swap: How complicated is the swap process? Are there specific tools or parts I need to be aware of?
  • Mechanical Specs: What are the key specifications I should look at when selecting a 6-speed transmission?
  • Personal Experiences: Would love to know your experiences! Any tips or things to look out for?

I’m hoping to get a few different perspectives before making a decision. Thanks in advance for your help! Can’t wait to hear from you all.

Context:

I currently have a 1990 Miata, and I’m mainly considering this upgrade for improved handling and performance. If anyone has advice on the reliability of the 6-speed versus the 5-speed as well, that would be fantastic!

Cheers,
dgardner

6 Likes
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I just swapped to a 6-speed transmission in my '95 Miata, and it’s a game changer! The extra gear gives you more flexibility on the highway and a better power band for performance.

4 Likes
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That’s great to hear! How has the shift feel changed? Is it smoother than the 5-speed?

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Yes, the shift feels much tighter and more precise. It definitely enhances the driving experience, especially during spirited driving.

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I’ve been researching this swap too. What were the biggest challenges you faced during the installation? Any advice on parts compatibility?

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The biggest challenge was sourcing the right adapter plate. I recommend getting a complete kit to simplify the process.

7

I feel like a 6-speed is more than just an extra gear; it’s about that quick response! But does anyone know how it affects fuel economy?

8

I’ve noticed a slight improvement on the highway. Higher gear means lower RPMs, which can help save fuel when cruising.

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Cost is another factor. How much should I expect to budget for a reliable 6-speed swap? Anyone have a ballpark figure?

4 Likes
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Expect to pay around $1,500 to $2,500 if you’re doing it right. It can vary based on condition and where you source it.

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Yeah, but you might lose some low-end torque. It’s all about what you prioritize. The performance benefits are amazing though!

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I’ve heard rumors that the 6-speed transmission is heavier too. Does anyone have insights on whether that affects handling?

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It adds some weight, but most people actually prefer the balanced feel it brings. Just make sure to upgrade your suspension accordingly.

3 Likes
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I think a 6-speed swap would be a great upgrade for track days. Just the extra control you get is worth it!

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I’ve read mixed reactions on the swap. Some say it ruins the spirit of the Miata—anyone feel that way?

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Honestly, I think any upgrade that enhances performance can only add to the Miata experience. More gears mean more fun!

6 Likes
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I guess if I swapped transmissions, I might forget how to drive stick! LOL. But seriously, I’m really considering it now after hearing all this.

6 Likes
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I’ve swapped to a 6-speed in my 2001 Miata, and the difference in driving experience is fantastic! Just keep an eye on the fluid levels; I recommend using Red Line MT-90 for smooth shifting.

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That’s awesome! Did you notice any noise after the swap? I’ve read some owners mention a whirring sound that can be concerning.

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For common issues, I’ve experienced a bit of grinding in 3rd gear. It’s usually due to not fully engaging the clutch. Also, make sure to adjust your clutch pedal distance if you have shifting issues.