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Rx8 differential

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Old 10-03-15, 03:48 AM
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Question Rx8 differential
DOES THE RX8 DIFFERENTIAL FIT IN THE RX7 FD DIFFERENTIAL CASE?

I mean, can I just swap the rx8 diff. in the rx7 fd case ?
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Old 10-03-15, 06:33 AM
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sure
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Old 10-03-15, 11:00 AM
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Search, I have a pretty thorough writeup on this.

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Old 10-03-15, 12:08 PM
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Short answer: Yep.


You probably could have searched for this, or asked in your 4.44 thread.
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Old 10-03-15, 12:43 PM
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Moral of the story: do your research before you buy.

Yes. You'll be fine with the 4.44 in the diff case. Just have a shop that knows what they're doing do the swap.
Last edited by MattGold; 10-04-15 at 12:23 PM.
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Old 10-03-15, 04:34 PM
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i thought the moral of the story was:

take a hammer to it, anything can fit with a hammer!
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Old 10-03-15, 05:07 PM
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Originally Posted by RotaryEvolution
i thought the moral of the story was:

take a hammer to it, anything can fit with a hammer!
This is also true.
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Old 10-03-15, 05:30 PM
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Ok I only swapped the wiring and pinion on my diff for the ring and pinion on the rx8 I had a whole rx8 diff .. did I just screw up or is there a benefit to using the fd diff with rx8 ring and pinion??
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Old 10-04-15, 12:00 AM
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both are torsens so there should be a negligible difference. however i hope you know how to properly set backlash, depth and adjust gear tooth patterns.
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Old 10-04-15, 12:31 PM
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Originally Posted by RotaryEvolution
both are torsens so there should be a negligible difference. however i hope you know how to properly set backlash, depth and adjust gear tooth patterns.

The rx-8 isn't a torsen. It's more like the tochigi fuji differentials found in some miatas. It has its advantages and disadvantages, but i'd pick the FD torsen if I had a choice.


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Old 10-04-15, 03:00 PM
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well that sucks, i got an 8's 3rd member LSD in the shop i was hoping to drop into my FC. maybe i'll just rebuild the clutch type S4 instead.
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Old 10-05-15, 10:12 AM
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That S4 clutch pack LSD is a lot more stronger then the 8's lsd from what I've read. I just picked one up for my FD because of this.
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Old 10-05-15, 09:36 PM
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clutch LSD's are great but they have the most limited lifespan, mine has always been a bit on the weak side. with 220k miles now it has seen better days.
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Old 10-06-15, 10:09 AM
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Originally Posted by RotaryEvolution
both are torsens so there should be a negligible difference. however i hope you know how to properly set backlash, depth and adjust gear tooth patterns.
I had a shop do it LOL
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Old 10-09-15, 02:19 AM
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I am just going to install ring and pinion 4.44, don't need the rx8 diff, my car has only 31 000 miles
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