RX7 LSD rear end

I've got a complete rear end for an RX7 from hub-hub. Includes disks, brakes, LSD, and driveshaft.

I'd like to see it go to a good home- it's taking up floorspace in my shop.

How about $150, delivered to the Challenge?

Definitely not shipping this one, but if you need it, I'll bet there will be someone at the Challenge willing to transport it near you!

I'm not interested in purchasing this, but I am curious what it is. Year, IRS/Solid, etc would probably be good information.

It would be great info, but I don't know. Came to me as part of a bulk parts buy.

Give me a few identifying items and I'll be happy to answer (I've never had an RX7, and don't know crap about them).

All I can tell you is it is in visually VG condition, and it's been in my shop for years.

Well, I can also tell you it's a solid axle, cause I can see that.

But no idea of the year, etc.

Drums or discs?

I think it says disks in the first post.

Disks.

Discs, axle diameter, bolt pattern, brake line pitch, I think are all tells. Sadly, I can't tell you off the top of my head what any of those specifically are.

Paul, can you check the bolt pattern to see if it is an FA or an FB?

SA and FB have the same bolt pattern, and SAs never came with disks.

If it's a factory LSD the bolt circle should be 114.3 mm.

In reply to DeadSkunk:

That is only for 13B-engined cars (GSL-SE).

The '81-85 GSL model had 4x110 and disks/limited slip.

More critical is what year it is from. '81-83 had small axle and '84-85 had large axle.

Knurled is correct

The bolt pattern is 4 x 110.

The diff housing has 8 bolts.

The brakes have 9 1/2" disks.

Didn't see any ID numbers.

You guys mentioning the year seem to forget, without giving me any identifying characteristics there is no way for me to tell you the year. Never had the car, and don't know RX7's.

Some of you said "big axles, small axles". Even if I was going to pull the axles, that's still not that helpful without knowing what the measurements of "big" and "small" is.

Bolt pattern is a pretty solid indicator of what it is.

In reply to MrJoshua:

You mean a '81-85 GSL?

Still doesn't tell you the axle size, does it?

In reply to SVreX:

Don't really care about the axle size, I don't need one.

The beauty of these forums..... I always thought that all the 4x110 rear ends were open dif. Now I know different.

DeadSkunk wrote: The beauty of these forums..... I always thought that all the 4x110 rear ends were open dif. Now I know different.

I would say that the large majority of 1st generation limited slip differentials on the RX7 are the 4x110 mm bolt pattern.

That's why the '83 is so beloved in SRX7. It's the only car that came with the LSD and 12A.

In reply to markwemple: OK, this is incorrect information, all 81 to 85 GSL cars are 12a powered and are factory LSD with disc brakes, during 83 the axle size was increased and a larger bearing was used which is the only difference in these and the 84/85 years, externally they are all identical.

84 and 85 GSL-SE 13B EFI cars are LSD but there a visible differences including the axle length, calipers location and 114.3 x 4 wheels stud spacing.

In addition the clutch packs are spaced differently in the GSL-SE so some say they are stronger but the spacing can be changed in the GSL, making them the same.

Also the GSL-SE has 4.1 ratio rather than the 3.9 in the 12a cars

In reply to DeadSkunk:

If they have rear disc brakes, they have LSD.

So, lot's of RX7 gurus, but no one needs a rear end?