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Old 09-10-2011, 07:43 PM   #1
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Default rx7 diff swap need help

I have the na 2nd gen diff, I'm broke and blew out my 1.6 diff need to know what I need to do the swap I have a driveline shop on call just need to know if I can just drop it out and put the rx7 one in bfeore I tear into it, thanks, cell is 2069488066 thanks
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Old 09-10-2011, 07:53 PM   #2
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Old 09-11-2011, 02:15 PM   #3
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Welcome to the site 1909miata, thanks for joining up!
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Old 09-11-2011, 04:43 PM   #4
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I'm going to go ahead and say if it's anything like my rx7 diff, you will need a miata pinion and pinion housing.
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Old 09-12-2011, 12:52 AM   #5
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Old 09-12-2011, 01:02 AM   #6
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your gonna need to find a solution to mount to the axles and driveshaft but this is how to mount the diff. your going to need to find a way to support the back of the miata trans as well..

https://www.miataturbo.net/showthrea...t=19010&page=4

https://www.miataturbo.net/build-threads-57/build-thread-fe3-rx7-tii-efr-6258-ms3-58140/

If the car is putting down less than 250whp i would be looking for another miata diff. trust me. its going to be much less of a headache.
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Old 09-12-2011, 04:11 AM   #7
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Quote:
Originally Posted by yank View Post
your gonna need to find a solution to mount to the axles and driveshaft but this is how to mount the diff. your going to need to find a way to support the back of the miata trans as well..

https://www.miataturbo.net/showthrea...t=19010&page=4

https://www.miataturbo.net/showthread.php?t=58140

If the car is putting down less than 250whp i would be looking for another miata diff. trust me. its going to be much less of a headache.
lolwut?

The "back half" of the na rx7 diff is essentially the same. You'll need miata bushings and to read the threads posted to figure out which axles to run.

The "front half" or pumpkin housing is totally different. You can run the actual rx7 differential unit, but will need to get a miata pumpkin housing.
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Old 09-12-2011, 09:47 AM   #8
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yank & tasty are talking about the 8" vs. the 7" - or turbo RX7 vs. the NA RX7. IMO the OP needs to find a 1.8 Miata rear, axles and shafts to do the swap. The only thing usable on the NA RX7 chunk is the ring gear and the housing (which still needs bushings).
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Old 09-12-2011, 10:02 AM   #9
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He clearly said he had a na diff so I don't know how that became part of the discussion. But cupcar is correct, except you can use the Rx7 differential itself as well. Though I'm not sure if any 2nd gen na Rx7s got a diff worth a damn.
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Old 09-12-2011, 11:23 AM   #10
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The NA rx7s had open diffs like the Miata or a clutch type (rebuildable) LSD that will drop into a 1.8 rear.
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Old 09-12-2011, 11:14 PM   #11
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I holed up other a buddy tight invthe junk yard business I think ill be able to find a LSD 1.8 for 200 and ill just sell the rx7 diff. I got it for 50. Bucks with 120k on it. What's it for it yeah??? worth?? I should be able to get 200
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Old 09-12-2011, 11:43 PM   #12
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The **** did you just say?
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Old 09-12-2011, 11:51 PM   #13
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He gets holed up tight by his buddy in the junk yard business I think.
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Old 09-13-2011, 12:00 AM   #14
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Quote:
Originally Posted by blaen99 View Post
He gets holed up tight by his buddy in the junk yard business I think.
Rofl
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Old 09-13-2011, 12:49 AM   #15
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where do you live? i have a 1.6 diff sitting in the garage that ill sell to you for cheap.\
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Old 09-13-2011, 12:50 AM   #16
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Quote:
Originally Posted by tasty danish View Post
lolwut?

The "back half" of the na rx7 diff is essentially the same. You'll need miata bushings and to read the threads posted to figure out which axles to run.

The "front half" or pumpkin housing is totally different. You can run the actual rx7 differential unit, but will need to get a miata pumpkin housing.
sorry my bad. i was half asleep when i read the post and was just shooting the few links i knew about.
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Old 09-13-2011, 01:50 AM   #17
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Quote:
Originally Posted by yank View Post
sorry my bad. i was half asleep when i read the post and was just shooting the few links i knew about.
It's ok, I jump at any opportunity to use "lolwut" as it's pretty much the greatest internet speak evar

Edit*** post 333, I am Satan's slightly less evil cousin!
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Old 09-13-2011, 10:10 AM   #18
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Quote:
Originally Posted by 1909miata View Post
I holed up other a buddy tight invthe junk yard
Quote worthy.

That aluminum housing on the RX7 diff is worth at least $50.
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Old 09-13-2011, 11:05 AM   #19
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What year is the RX-7 dif from? I may be interested in buying the dif from you if you go down that route.
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Old 09-13-2011, 01:18 PM   #20
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Sry I was half asleep and on my phone. I have* a buddy in the junk yard buss. I live in sacramento. I can always pay shipping as well I believe its an 88 or so its a 2nd gen non turbo w/o stub hubs

Last edited by 1909miata; 09-13-2011 at 01:19 PM. Reason: adding info
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