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Old 02-02-2007, 10:08 PM   #1
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Default transmission/rear-end set-ups

I know both the 1.8L tranny/rear end and the RX-7 rear end/tranny somewhat bolt in... but which parts out of which cars and what year fit where? what all will i need to get from each?

I want to do an rx-7 tranny/rear -end if possible but it'll probably be the most difficult to do...what all will i need out of the rx to make it easiest?

EDIT: this will be going in a 1990 1.6L
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Old 02-02-2007, 10:12 PM   #2
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its going to be harder than you think.
http://www.geocities.com/crash41301/
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Old 02-02-2007, 10:14 PM   #3
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http://members.aol.com/solomiata/Drivetrain.html

If you have not, you might want to read through this.
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Old 02-02-2007, 11:42 PM   #4
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mark williams will make custom ring and pinions at a fair price. I may have one drawn up for my car soon. You can run a clutch type aftermarket diff and ring/pinion for a decent price, and not have to worry about fab.
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Old 02-02-2007, 11:51 PM   #5
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He said he had a RX7 read-end. But didn't specify if it was a TII. If not and it's a standard 84-89, 91-94 rear, then both can work without fabrication. What rx-7 rear do you have?
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Old 02-03-2007, 01:32 AM   #6
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It's the '86-'91, non-turbo RX-7 diffs. that you want. Most likely the '86-'89 S4 diffs., as those are the ones with clutch-type diffs. The '93-'95 RX-7s (FD) used 8" rears that will take mucho fabrication to make work, just like the 8" from the '86-'91 Turbo II.

You should really search on this, as I know I've answered this exact question a number of times.
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Old 02-17-2007, 03:50 AM   #7
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Ok ive been looking at some of the salvage yard sites for an RX7 diff assembly and have a few further questions. Does it matter if the axle is locking or non-locking, if the car is automatic or manual, or if the car is convertible or coupe? I ask because this is how the sites I am looking at are sorting their parts.

Also are there any models that had an open differential?

Oh yeah, also, i found two listed under "nonturbo, m/t, coupe" fpr $165 + $75 for shipping, im looking for a little lower, whatcha think?
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Old 02-17-2007, 12:11 PM   #8
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A "locking" axle means limited-slip. I suspect you want an LSD, right?
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Old 02-17-2007, 01:39 PM   #9
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yes definitely, so if its listed under non-locking then it is an open differential?
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Old 02-17-2007, 02:02 PM   #10
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Ummm...yes.
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Old 02-17-2007, 03:09 PM   #11
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Ok i have someone from the rx7 boards who has one but he wants a picture of the unit just to make sure its the right one. anyone have a picture of it?
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Old 02-17-2007, 03:40 PM   #12
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Quote:
Originally Posted by akaryrye View Post
Ok i have someone from the rx7 boards who has one but he wants a picture of the unit just to make sure its the right one. anyone have a picture of it?

I'm confused, aren't you the one buying something here? Why do ou need a picture?...I don't get it lol.
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Old 02-17-2007, 03:40 PM   #13
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1. 1.8 open converted to RX7 LSD:

Parts:
94-05 1.8 Miata open assembly
84-91 NON-TURBO Rx7 clutch-type lsd (89-91 is a viscous, don't bother)
94-95 Miata stub shafts or 86-88 RX7 stub shafts and 94-95 Miata half-shafts
or 96-05 Miata axles (no stubs needed)
RX7 Circlips (fit onto the end of the stubs/axles, miata clips will not fit)
94-05 Miata driveshaft
Miata or RX7 ring and pinon (ring teeth / pinon teeth = end-ratio)


2. 86-88 RX7 assembly conversion:

Parts:
86-88 RX7 NON-TURBO differential assembly
94-95 Miata stub shafts or RX7 stub shafts and 94-95 Miata half-shafts
or 96-05 Miata axles (no stubs needed)
RX7 Circlips (fit onto the end of the stubs/axles, miata clips will not fit)
94-05 Miata driveshaft
Miata or RX7 ring and pinon (ring teeth / pinon teeth = end-ratio)
Miata Pinon housing (pumpkin) (find at RX7 performance shops)
Miata Diff. Bushings


84-85 RX7 LSD PUMPKIN
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Old 02-17-2007, 05:02 PM   #14
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i hope that's a table painted to look like your car!
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Old 02-17-2007, 05:06 PM   #15
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brain, you are the man, thanks

Last edited by akaryrye; 02-18-2007 at 01:58 AM.
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Old 02-17-2007, 05:21 PM   #16
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Quote:
Originally Posted by Braineack View Post
1. 1.8 open converted to RX7 LSD:

Parts:
94-05 1.8 Miata open assembly
84-91 NON-TURBO Rx7 clutch-type lsd (89-91 is a viscous, don't bother)
94-95 Miata stub shafts or 86-88 RX7 stub shafts and 94-95 Miata half-shafts
or 96-05 Miata axles (no stubs needed)
RX7 Circlips (fit onto the end of the stubs/axles, miata clips will not fit)
94-05 Miata driveshaft
Miata or RX7 ring and pinon (ring teeth / pinon teeth = end-ratio)
is this the same if you have a 1.8 torsen?

if so Im picking up a lsd asap!
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Old 02-17-2007, 09:33 PM   #17
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yeah, you can pull out the torsen and sell it on EBAY and walk away with money in your pocket after the RX7 swap.

I'll do a write-up when I perform my RX7 LSD swap so you guys can get a better idea of exactly what to do.


akaryrye, PM R-1 on rx7club.com, he should have one. It will measure 7" diameter on the ring-gear, 6" without the gear attached.
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Old 02-17-2007, 11:41 PM   #18
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Quote:
Originally Posted by Braineack View Post
akaryrye, PM R-1 on rx7club.com, he should have one. It will measure 7" diameter on the ring-gear, 6" without the gear attached.
In the meantime, I have been messaging back an fowarth with the guy and he sent me a picture, but it does not look exactly like the one you put up brian, almost looks like an aftermarket piece.

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heres another pic of an rx7 diff i found earlier:

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Old 02-18-2007, 01:42 AM   #19
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I'm Brian...he's "Brain." Although I couldn't begin to tell you how many people have misspelled my name as "Brain" over the years...never figured out why. I mean, it's one thing when it's Valentine's Day in 2nd grade and a fellow 7-year-old gives you a card that says, "Would you be my valentine, Brain." Not sure why it still happens.
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Old 02-18-2007, 01:51 AM   #20
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Im just glad that I wasnt the only one that thought the solo miata instructions were a little obtuse.

could that other diff, be like a mazdaspeed special or somthing like that, oem but similar sized?
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