Mark Harris

Thanks for your help. If not would it appear as an option on the bonnet sticker and does anyone know what option code that would be.

johnsjmc

I believe they all had LSD. They may not all have the 4 channel ABS active LSD My 993 C2 has LSD but it,s the active diff opt. 220

Canyon56

I always wondered too. Here's a thread from 5 years ago: https://rennlist.com/forums/993-foru...n-lsd-too.html

fwiw, here's a description from Porsche's own 993 literature:

"The center differential measures engine temp, rpm, and power output before deciding how much slip there will be between the front and rear axles. A locking differential in the rear administers the torque split between the rear wheels. These 2 differentials send the engine's power to the wheel having the most grip. They are augmented further by the ABD (Automatic Brake Differential), which is an ABS driven traction device that helps reduce wheelspin further."

Nollie

Only ones from special dealers...

joking aside, mine did

jaa1

answer is NO, not all C4S came with LSD, it was optional.. at least mine does not have it..

ilko

They all do - manual tranny, LSD, 4-channel ABS. If you have a C4S, jack up the car, and rotate the rear wheels. Both should move in the same direction. If they don't it means the LSD plates have worn out. Again, they all have LSD.

Here is the list of standard options a US C4S has: 032 058 130 197 218 220 224 235 288 323 329 335 339 379 380 413 423 434 441 454 455 480 484 491 530 534 544 553 562 566 567 573 576 599 602 650 651 657 660 685 912 937 946 975

Don't believe me? Take your C4S to a Porsche dealer and have them run the VIN in their system. You'll get that same sequence of 3-digit option codes.

goofballdeluxe

Every time I see this kind of thread, I think of this: I guess this guy really loved his limited slip differential...

Joe S.

All Carrera 4/4S had the LSD.

jaa1

I guess mine are worn out then.. does anyone have the part numbers on the LSD plates??

Mark Harris

It's probably a good thing you and I didn't know each other in college.

Mark Harris

Thank you.

e9stibi

Just contact Guards Transmission. You might consider better quality plates, in particular when the car sees the track.

http://www.guardtransmission.com/

chris walrod

+1 the plasma sprayed plates are much more durable.

If one's lsd fail the tire turn test, it doesnt necessarily mean the diff is entirely inop, just that you've lost clutch pack preload.

PorscheDoc

Mark if you shoot me the vin, i can run it in PET.