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Old 08-27-2012, 12:05 PM   #1
dburgoon
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Default RWD Tranny for ej20?

Let me start off by saying I searched and couldnt find anything.

Secondly the reason I am asking is, this is not for my wrx, I would never make that rear wheels drive. AWD over anything!

I work at a shop that strictly works on miatas, and I love the platform of the car, besides the engine. What I want to do is put an ej20 in my miata for a couple reasons.

1. Lower center of gravity.
2. POWER!!

So with that being said, I need to find a tranny to use for the RWD application. I seen somewhere that a guy makes a bellhousing to fit a toyota transmission to the ej.

Right now all Im doing is recon, as I am trying to price is all out.

Any help will be greatly appreciated. Thanks
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Old 08-27-2012, 12:44 PM   #2
wcjuggalo
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http://www.billsautofab.com/
this guy can make you a adaptor for a toyota 5speed.
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Old 08-27-2012, 01:45 PM   #3
dburgoon
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Should've also mentioned, I'm looking at 350rwhp so I need a tranny to hold up to that.

Thanks
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Old 08-27-2012, 06:36 PM   #4
2000subie
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I'm sure the stock wrx 5mt with rear wheel drive conversion would work. Mine lasted at 320awhp, with lots of launches. 350rwhp won't beat on one near as hard as 320awhp.
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Old 08-27-2012, 10:26 PM   #5
dburgoon
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Quote:
Originally Posted by 2000subie
I'm sure the stock wrx 5mt with rear wheel drive conversion would work. Mine lasted at 320awhp, with lots of launches. 350rwhp won't beat on one near as hard as 320awhp.
This is true, I would imagine it will hold the power, but I also want 1st gear to be available. I know there's a way to get into 1st, just not sure of it
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Old 08-27-2012, 10:30 PM   #6
2000subie
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I'm not sure how either. My car for sure didn't like it going over 15mph.
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Old 08-27-2012, 11:13 PM   #7
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Quote:
Originally Posted by 2000subie View Post
I'm not sure how either. My car for sure didn't like it going over 15mph.
If I could figure that out, I might consider using the stock 5 speed. But I would really like use something with a little lower gearing. I know the t56 has a pretty good gearing, but its also heavy.. I just dont think I really will ever get exactly what I want.
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Old 08-27-2012, 11:28 PM   #8
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Quote:
Originally Posted by 2000subie
I'm sure the stock wrx 5mt with rear wheel drive conversion would work. Mine lasted at 320awhp, with lots of launches. 350rwhp won't beat on one near as hard as 320awhp.
You're neglecting key factors here. There's more than just a transmission in question... It connects to a couple of things
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Old 08-28-2012, 12:04 AM   #9
2000subie
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Quote:
Originally Posted by dburgoon

If I could figure that out, I might consider using the stock 5 speed. But I would really like use something with a little lower gearing. I know the t56 has a pretty good gearing, but its also heavy.. I just dont think I really will ever get exactly what I want.
Yeah that's the bad thing about custom jobs. There's always the sti 6mt but then your talking double the $.
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Old 08-28-2012, 12:09 AM   #10
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Quote:
Originally Posted by 03Rextacy

You're neglecting key factors here. There's more than just a transmission in question... It connects to a couple of things
If your talking rear diff. That's not necessarily a issue. As if he is willing to spend the cash on a subie to miata swap, I'm sure he wouldn't have an issue having a custom drive shaft made to meet the needs of the rear diff. he uses. The drive shaft and trans crossmember would honestly be my least issues of everything, as there easily fixed. I made my own trans crossmember for my sbc to mightymax swap. It only took about 2hrs. And my own shaft then just had it balanced.
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Old 08-28-2012, 12:16 AM   #11
dburgoon
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Quote:
Originally Posted by 2000subie

If your talking rear diff. That's not necessarily a issue. As if he is willing to spend the cash on a subie to miata swap, I'm sure he wouldn't have an issue having a custom drive shaft made to meet the needs of the rear diff. he uses. The drive shaft and trans crossmember would honestly be my least issues of everything, as there easily fixed. I made my own trans crossmember for my sbc to mightymax swap. It only took about 2hrs. And my own shaft then just had it balanced.
The drive shaft is no problem, I have all of the tools to make one as well as a crossmember. The only question I really have is which tranny to use, and how to get the engine and tranny to become friends.

As far as rear diff, I'm not sure what I want to use yet, I could use the Miata LSD which I know well or I have a 240sx LSD laying around, and also a rear end out of a viper. They are all very good diffs and because I'm not looking for massive amounts of power I think I would stick with the Miata LSD.
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Old 08-28-2012, 10:58 PM   #12
lgt2000
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You may want to check dimensions. IIRC the miata had 26.5in between the framerails and the ej25 is around 30in wide
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Old 08-29-2012, 12:07 AM   #13
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Old 08-29-2012, 12:07 AM   #14
dburgoon
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Quote:
Originally Posted by lgt2000
You may want to check dimensions. IIRC the miata had 26.5in between the framerails and the ej25 is around 30in wide
This is true but as my favorite saying goes "with enough speed anything will fit" lol

But honestly I was thinking about doing a full tube front and mid section to really stiffen the car, that way I could build the frame to fit whatever I wanted.
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Old 08-29-2012, 12:43 AM   #15
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I see where you are going with the tube front end and you could work it in. I want to see images if you decide to do it as we have a few miata's and some subaru's. One of the miata's is 1.8L, the other 5.3L, and the subaru is 6.0L so we are in the unconventional camp as well. If you want a stronger trans that is based on the toyota R154 check out the Aisin AY-6. They are good for around 340 ft-lbs of torque and are 6-speed. You can find them for $200-300 at times
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