what is the cheapest way to get a rear end in a miata that will hold 225whp? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 09-28-2006, 10:19 PM   #1
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Default what is the cheapest way to get a rear end in a miata that will hold 225whp?

I'm having a really tough time finding a solution aside from just buying a swap 01+ car...which is my best option but hard to find one at a salvage auction and be sure it has an lsd.

I have a 1.6 btw.
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Old 09-28-2006, 11:18 PM   #2
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The standard 1.8 open dif will handle that much power and is considerably cheaper than an LSD. But if you have to have LSD, then the 1.8 is the way to go. You can get a total package inlcuding drive shaft, axles, and pumpkin from planetmiata for around $1000 I think. They pop up in the classifieds occasionally. I've seen them for about $700 a couple times. But the best way is to find one in a junkyard and hope they don't know what it's worth.
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Old 09-28-2006, 11:51 PM   #3
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I bought a 1.8 driveline (diff, half shafts, drive shaft) for under $500 shipped to ATL from TX. Just picked up an rx7 clutch lsd for $100 which will drop in to the 1.8 diff. That's about the cheapest. Add another $250 to replace the lsd disks/plates.

Last edited by m2cupcar; 09-29-2006 at 10:22 AM.
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Old 09-29-2006, 12:07 AM   #4
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Dude, where'd you buy the disks/plates for $50? Mine were like $200 shipped from Mazdaspeed.
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Old 09-29-2006, 10:22 AM   #5
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That was supposed to be $250. fixed. sorry.
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Old 09-29-2006, 10:42 AM   #6
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yeah, I'll just hold out for the swap car, or a salvage yard find.
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Old 09-29-2006, 10:43 AM   #7
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Quote:
Originally Posted by m2cupcar View Post
I bought a 1.8 driveline (diff, half shafts, drive shaft) for under $500 shipped to ATL from TX. Just picked up an rx7 clutch lsd for $100 which will drop in to the 1.8 diff. That's about the cheapest. Add another $250 to replace the lsd disks/plates.
can you drop the rx7 diff into the miata open diff ring? What years and model of rx7?
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Old 09-29-2006, 11:57 AM   #8
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Yes. 84-88 for the clutch type (what you want). If it's first gen, make sure it is "large axle" to fit the Miata.
Pdf file on the rx7 diff swap
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Old 09-29-2006, 12:34 PM   #9
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Yes, it's been talked about ad naseum, especially on the Miata forum, so go over there and search and read Randy's pages here: http://members.aol.com/solomiata/MiataCSP.html

Long story short, you can drop any '86-'91 RX-7 diff. internals into any '94-'05 Miata diff. housing.
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Old 09-29-2006, 02:52 PM   #10
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Quote:
Originally Posted by bripab007 View Post
...you can drop any '86-'91 RX-7 diff. internals into any '94-'05 Miata diff. housing.
as long as it's not a turbo rear
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Old 09-29-2006, 03:06 PM   #11
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Yeah, I meant to add that...thanks
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Old 09-29-2006, 04:41 PM   #12
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Quote:
Originally Posted by samnavy View Post
The standard 1.8 open dif will handle that much power and is considerably cheaper than an LSD. But if you have to have LSD, then the 1.8 is the way to go. You can get a total package inlcuding drive shaft, axles, and pumpkin from planetmiata for around $1000 I think. They pop up in the classifieds occasionally. I've seen them for about $700 a couple times. But the best way is to find one in a junkyard and hope they don't know what it's worth.
I got the whole rear suspension off a 95M miata for 400. Yes, I got lucky I kept the axles, Torsen, Driveshaft and sold everything else.
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Old 10-02-2007, 07:26 PM   #13
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Since when is a driveshaft, def and axles labeled as suspension parts?
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Old 10-02-2007, 10:28 PM   #14
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I ended up paying $400 for a type-2 swap open diff, with a loose torsen.
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Old 10-02-2007, 11:10 PM   #15
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Quote:
Originally Posted by hustler View Post
I ended up paying $400 for a type-2 swap open diff, with a loose torsen.
not bad at all!
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Old 10-03-2007, 09:28 AM   #16
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Quote:
Originally Posted by hustler View Post
I'm having a really tough time finding a solution aside from just buying a swap 01+ car...which is my best option but hard to find one at a salvage auction and be sure it has an lsd.

I have a 1.6 btw.
FYI, a call to Mazda (800-222-5500) with the VIN will tell you if the car came with an LSD. Now whether somebody already harvested it or not....
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Old 10-03-2007, 09:31 AM   #17
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Quote:
Originally Posted by cwisenheimer View Post
FYI, a call to Mazda (800-222-5500) with the VIN will tell you if the car came with an LSD. Now whether somebody already harvested it or not....
or I could just look at them.
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Old 10-03-2007, 09:32 AM   #18
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FYI, he started this post over a year ago and just mentioned a couple posts up that he ended up buying a Type-2 Torsen for $400.
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Old 10-03-2007, 04:58 PM   #19
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^Exactly. Danimal, while using the search function, don't forget to check out the date. Dredging up a year old post for no reason takes you back to NOOB status.
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Old 10-04-2007, 12:30 PM   #20
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ok so here's my deal, there's an 88 anniversary edition rx-7 sitting in my friends garage. the engine doesn't work but everything else works. should i buy it for 500 bucks and use anything on it to build a solid foundation for my 97 miata? i'm planning on turbo later and probably want somewhere around 250hp. any suggestions or should i buy the rx7 and fix up the engine ($? for that)...decisions decisions....any help welcome
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