What's this RX7 diff I have?

[mbuskuhl]

Can the RX7 experts help me please identify this extra diff I have? By my calculations it's a 4.10 (I didn't count the teeth but it took slightly over 4 turns to get the ring gear back around). The ring gear is 7" so it's a NA rear. Is that a clutch type LSD (sorry if that's a stupid question)? If so, is that the factory LSD or ? I saw another picture of what is supposed to be a factory LSD and mine looks a little different. I'm trying to figure out as much as possible about what I have here. Thanks!!

[sirchadd]

Send that picture to Mike @ iscracing he can tell you probably just by looking at the picture. I can't tell is it the original and if so what year is your car?

Model/ Version 1986-1988

SE or GX Standard/ 4.1
GTU Heavy duty LSD Clutch type/ 4.1
GXL Standard w/ AAS LSD Clutch type/ 4.1
Convertible Standard/ 3.9
Turbo II/ 10th AE Heavy duty LSD Clutch type/ 4.1

1989-1990 specs:

Model/ Version Standard Open/ 4.1*
GTUs Standard VLSD/ 4.3
GXL Standard w/ AAS Open/ 4.1*
Convertible Open/ 4.1*
Turbo VLSD/ 4.1


Maybe these specs will help you.

[C. Ludwig]

clutch type lsd

[mbuskuhl]

Thanks. That's what I was guessing.

crevolution - welcome to the board. I have an '86 VIN but the sheetmetal is about the only thing '86. On a side note, I saw you might be interested in a 4.10 LSD. I'd be willing to part with this one, I upgraded to the 5.12 a few months ago. This was the diff I had been using in the car, worked good when removed and raced only about 4 hours. I do not have the alum. case, I needed it for the 5.12. I have been going through all my "extras" I don't need. PM if interested, trades considered.

[ddewhurst]

Yes to what Chris said. You can see the disc pack in the first picture near you & in the second second picture at the left hand side.