Broken Diff & An Age Old Question - Miata Turbo Forum -Boost cars, acquire cats.

Welcome to   Members

Prefabbed Turbo Kits A place to discuss prefabricated turbo kits on the market TrackSpeed

LinkBack Thread Tools
Old 09-03-2006, 01:40 AM   #1
Junior Member
Thread Starter
iTrader: (6)
Join Date: Apr 2006
Posts: 259
Total Cats: 0
Default Broken Diff & An Age Old Question

Launched it at the track (about 3-4k) tonight and the sweet sound of broken parts rang or clanked. Didn't really read about the diffs on the forum till tonight as mine did work. Not 100% sure as I haven't taken anything apart but trans still engages and same with the clutch but when gradually letting out the clutch and moving forward makes a horrible clanking noise and then moves again, and so on. I have a 1.8L ACT flywheel with the regular pressure plate and the street disc. I guess with this clutch setup especially some guys on here have had the same problem. Anyhow, to get to my question which searching around was somewhat answered; What's the most affordable way to fix the diff and with what setup.

As I understand the 1.8L setups which are 7" instead of the 1.6L 6" are much stronger and would be the better upgrade. Now as I would love an LSD or Torson rear end it's more than I would like dish out right now so I'm on a budget. With the setup you suggest (please if you know) list the best place to get the diff (and/or parts).

** I know of a miata in a local junkyard here that has a production date of 94 and has motor, trans, diff, etc. Not sure if this would be a good donor car.

Thanks In Advance!
danscreations is offline   Reply With Quote
Old 09-03-2006, 07:56 AM   #2
Senior Member
steelrat's Avatar
Join Date: Jul 2005
Posts: 514
Total Cats: 0

All 94+ cars will have the 7" diff... the question is open or torsen.....

M1 1.8's (94-97) are a 4.3 ratio
M2 1.8 99-00 are 4.10 again -- unless it's a 6-spd... then different. (don't know for sure about the 01+... but I assume they are still the 4.1

To swap with 1.6's you need the driveshaft and the half-shafts when you get the diff.... So if you get the stuff out of the wrecker get all of it.

You'll need a "big-***" socket (28 or 31mm) to break the lock nuts at the end of the shafts. They are 200 ft-lbs or something insane like that... so bring a really, really big braker....

Otherwise, get all of it, and you'll be good to go.

steelrat is offline   Reply With Quote
Old 09-04-2006, 06:49 PM   #3
Senior Member
Join Date: Dec 2004
Posts: 1,450
Total Cats: -1

Actually, it's the '94-'94 cars that have the 4.1 rear-end; the 4.3 is in the '99+ 6-speed cars.

See here for more:
bripab007 is offline   Reply With Quote
Old 09-05-2006, 10:18 PM   #4
Junior Member
Join Date: May 2005
Location: Tampa, FL
Posts: 132
Total Cats: 1

I'm on my third diff in one year. (1) 90' open, (2) a somewhat-wonky 93' viscous LSD and (3) a low-mileage 93' viscous diff. If swapping 1.6 diffs, all you need is the pumpkin; you don't need the halfshafts.

The weak link in the old diffs is the ring gear which just shreds and tears up the pinion gear.
Hammerhead is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Raleigh: Fiberglass headlight scope, 1.6L ECU, AFM, Hardtop latches, more bigmackloud Miata parts for sale/trade 9 11-07-2015 11:58 PM
Another Alternator thread ihiryu General Miata Chat 9 09-28-2015 10:22 AM
WTB 90-97 miata low profile headlight kit DonPlatt WTB 0 09-25-2015 02:57 AM

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 05:10 AM.