Amazon: - MX-5 (MIATA) gearbox behind a B20?

nonhog · Oct 28th, 2014, 15:05

Was looking at the Miata transmission gear ratios and they are very close to the Amazon M40 box.

MX5 122

3.13 3.13
1.88 1.99
1.33 1.36
1.00 1.00
.814

The big question is has anyone done it? I get that machining and adaptors will be needed. As well as finding the clutch set up that works.

Thoughts?

Quarterless · Oct 28th, 2014, 15:54

Sorry don't know anything about that. Wouldn't you be better going T5?

nonhog · Oct 28th, 2014, 16:11

Quote:

Originally Posted by Quarterless

Wouldn't you be better going T5?

I'm aware of that swap, but it seems to have mixed reviews. Noisy is one issue I keep hearing. I'm not ruling it out I just would like to consider other options.

classicswede · Oct 29th, 2014, 19:46

The ratios do look alright and for a 5 speed upgrade on a tame engine they should be upto it. The main issue I see with them is they are very long and making an adaptor is not going to be simple. They are cheap so an interesting idea to look into

nonhog · May 7th, 2018, 20:16

Been a few years. Still no progress on transmission swap. Kid is in college still so its just a thought process for now. Thought I would bump this just in case someone has news on this idea? Never know.

Oct 28th, 2014, 15:05	#1
nonhog Senior Member Last Online: Jun 26th, 2022 22:30 Join Date: Mar 2010 Location: Seattle/Tacoma View Photos By: nonhog	MX-5 (MIATA) gearbox behind a B20? Was looking at the Miata transmission gear ratios and they are very close to the Amazon M40 box. MX5 122 3.13 3.13 1.88 1.99 1.33 1.36 1.00 1.00 .814 The big question is has anyone done it? I get that machining and adaptors will be needed. As well as finding the clutch set up that works. Thoughts? __________________ 80 Bertone 5.0 Ford swap underway. http://www.volvoforums.org.uk/showthread.php?t=129720 66 Amazon Estate mild mods in the near future. (http://67-72chevytrucks.com/vboard/s...d.php?t=332836)

Oct 29th, 2014, 19:46	#4
classicswede Trader Volvo in my veins Last Online: Today 09:29 Join Date: Dec 2004 Location: Anglesey	The ratios do look alright and for a 5 speed upgrade on a tame engine they should be upto it. The main issue I see with them is they are very long and making an adaptor is not going to be simple. They are cheap so an interesting idea to look into __________________ http://www.classicswede.org www.classicswede.co.uk

May 7th, 2018, 20:16	#5
nonhog Senior Member Last Online: Jun 26th, 2022 22:30 Join Date: Mar 2010 Location: Seattle/Tacoma View Photos By: nonhog	Been a few years. Still no progress on transmission swap. Kid is in college still so its just a thought process for now. Thought I would bump this just in case someone has news on this idea? Never know. __________________ 80 Bertone 5.0 Ford swap underway. http://www.volvoforums.org.uk/showthread.php?t=129720 66 Amazon Estate mild mods in the near future. (http://67-72chevytrucks.com/vboard/s...d.php?t=332836)

Oct 28th, 2014, 15:54	#2
Quarterless Master Member Last Online: Jan 3rd, 2024 19:13 Join Date: Mar 2008 Location: Essex	Sorry don't know anything about that. Wouldn't you be better going T5?

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