jeff_man

iTrader: (7)

tl:dr

Do a burn out and if there are 11s then you have a torsen.

soviet

iTrader: (10)

for 99-00 NBs you apparently can look at the door jamb and find an "NCxx" number.

90 Turbo

iTrader: (3)

Ok can anyone confirm that if you look thru the rearend where the axle hubs push in if there is a bar its open if no bar its torsen. I have a junk yard with a 95 5 speed rearend but no vin. Car was crushed.

I need some way of finding out. I know with my open 1.6 diff there is a bar with the torsen rear end for 90-93 there is no bar so is the same true of 1.8 rear diffs.

90 Turbo

iTrader: (3)

Here is a pic. There looks to be some sort of rubber dampener at the pinion. Is that right or is that for automatics?

gearhead_318

iTrader: (1)

I believe it was states in this thread that there where only open diffs for 89-93 cars. Also, don't torsens have different ratios then a open diff? If you know the ratio of the open diff and of the torsen, you can figure out which one it is.

90 Turbo

iTrader: (3)

the torsen in the 90-93 cars is different and not as effective but it was avail.
Torsen and open have same ratio. I found a post on id'ing them. i will post it over here. From that post the rubber thingy is a good sign and if it does not have a bar it is prob torsen.

90 Turbo

iTrader: (3)

http://www.miata.net/garage/diffguide/index.html

gearhead_318

iTrader: (1)

Miata.net is a great resource for this kind of stuff.
BTW, you can edit your posts once you've posted them to add information so you don't have to make multiple posts.

wannafbody

iTrader: (1)

The viscous was the LSD in the 90-93's.