rx8 r/p on 86-88 rx7 lsd

[pitbull113]

So I get the 86-88 rx7 non turbo lsd to install in the miata case. After reading on several websites that the rx8 4.44 r/p is tha same and will fit I go buy one. Well it doesn't. The 4.44 is too big and I'm wondering did I get the wrong info or the seller of the r/p give me the wrong parts. This is just one of the links to the info I was going by http://www.turbomagazine.com/tech/0804_turp_kia_sportage_s2000_garage_tech/index.html Can anyone confirm or deny that the rx 8 r/p fits the lsd from the 86-88 na rx7 and 94-97 miata like I've been told.

[seckerich]

No, it does not. The ring gear is the same size as the 86-91 Turbo 2 RX7 but the pinion is shorter. Limited slip from 86-91 NA RX7 will fit the 1800 Miata rear end.

[pitbull113]

Thanks Steve. I guess it's always advisable to seek the advice of an expert before you believe something on the internet. I guess if I buy a boat I have an anchor:shrug:

[pitbull113]

Limited slip from 86-91 NA RX7 will fit the 1800 Miata rear end.
86-88 is the clutch type and 89-91 is a torsen right?

[seckerich]

All of them are clutch type. I heard they put the Torsen in some of the 91 cars but never actually saw one. The Torsen we use in the ITS cars is actually a Miata unit. I think I have one on a shelf somewhere. Keep in mind that the ring and pinion from a first gen RX7 fits the 1800 Miata case. Off the shelf gears are 4.88, 5.12, and very hard to find 4.6 and 4.44 that were old RX3 gears.

[pitbull113]

Thanks again Steve. mazdaspeed motorsports shows a 4.44 for the miata @ $480. I don't know if they still carry the gears but I was able to put it in my shoppingcart.

[Andy Bettencourt]

Thanks again Steve. mazdaspeed motorsports shows a 4.44 for the miata @ $480. I don't know if they still carry the gears but I was able to put it in my shoppingcart.

I think I bought the last one in July.

[pitbull113]

I think I bought the last one in July.:eek:

[C. Ludwig]

86-88 is the clutch type and 89-91 is a torsen right?


86-88 is clutch type. 89-91 is viscous. There were also open diffs is quite a few of them so you're no guaranteed an LSD if you buy one.

[pitbull113]

86-88 is clutch type. 89-91 is viscous. There were also open diffs is quite a few of them so you're no guaranteed an LSD if you buy one.yeah i found that out the hard way.