In 1984, the M491 option.

[wdizard]

Did this option include a limited slip differential?



In 1984, Porsche also introduced the M491 option. Officially called the Supersport, it was commonly known as the "Turbo-look". It was a style that resembled the Porsche 930 Turbo with wide wheel arches and the distinctive "tea tray” tail.

[Bill Verburg]

Originally Posted by wdizard

Did this option include a limited slip differential?



In 1984, Porsche also introduced the M491 option. Officially called the Supersport, it was commonly known as the "Turbo-look". It was a style that resembled the Porsche 930 Turbo with wide wheel arches and the distinctive "tea tray” tail.

no, a 40% lsd was a separate option, M220

[wdizard]

Is it expensive to add this to a 1984 911?

[GaryR]

About $1500 + labor for a Guards unit set to whatever % you want last I looked..

[Buckterrier]

I have the original window sticker for my car. Kind of odd. No sport package, spoilers chin lips etc. But the guy ordered it with a LSD. Lucky me!

[GaryR]

Originally Posted by Buckterrier

I have the original window sticker for my car. Kind of odd. No sport package, spoilers chin lips etc. But the guy ordered it with a LSD. Lucky me!

Mark - ever have the clutch pack in it checked/replaced? I have heard they are fairly short lived (if it's original I would think it needs a rebuild). Guard will do it, for one.

[-84 Carrera]

Originally Posted by GaryR

Mark - ever have the clutch pack in it checked/replaced? I have heard they are fairly short lived (if it's original I would think it needs a rebuild). Guard will do it, for one.

I also have the diff (factory option), how can you tell if it needs to be serviced?

/C

[GaryR]

Originally Posted by -84 Carrera

I also have the diff (factory option), how can you tell if it needs to be serviced?

/C

Really don't know (assume a visual inspection is one way) but I bet a call to Guard will get you an answer if no one pipes in here...

[Peter Zimmermann]

Originally Posted by -84 Carrera

I also have the diff (factory option), how can you tell if it needs to be serviced?

/C

No service required. If you detect "chatter" during city driving while going around corners, it's possible that your diff needs an additive designed for limited slip. Chatter will cause premature wear, so be sure this doesn't happen.

[GaryR]

So Peter, are you saying the clutches never wear out in normal-heavy (track) use?

[-84 Carrera]

Originally Posted by Peter Zimmermann

No service required. If you detect "chatter" during city driving while going around corners, it's possible that your diff needs an additive designed for limited slip. Chatter will cause premature wear, so be sure this doesn't happen.

I use the swepco oil. Is that the right kind for the limited slip diff?