nize

1) does anyone know if the factory LSD on the 951 is clutch-based?

2) if so, is there an easy way to test how worn the LSD is?

many thanks.

hally

u could put i wheel in the gravel and 1 on the road & give it some juice!

User 41221

Yes, the factory LSD is clutch based. To test it, jack up both rear wheels (and please use jack stands, okay?), put th etranny in neutral and turn one wheel clockwise with a helper holding the other wheel. If the helper can hold the wheel stationary or keep it from turning as fast as the other wheel, your clutches are worn to the point of needing to be replaced. Its not a terribly difficult or expensive job to have the clutches replaced, altho if you don't have decent wrenching experience, I'd suggest getting a shop to do it for you.

Regards,

josephsc

I'm at the same place -- need to do a rebuild. I found the parts list from this thread to be helpful (and Sunset has great prices on them): https://rennlist.com/forums/944-turbo-and-turbo-s-forum/186871-lsd-rebuilding-kit.html

nize

has anybody replaced the stock LSD with the torsen gleason LSD ?
http://members.rennlist.com/951_racerx/PS84Gleason.html

i'm wondering if it's better to replace rather than repair.

smlporsche

Another question:

Can you rebuild an open diff into a LSD using Porsche parts?

If so does anyone have any advice??

My track car was "suppose" to have a LSD but the option # on the car don't support this claim (I have not had it on the track yet)

'89 944 S2

schnellfahrer

If the LSD is worn out, should one replace the clutches, or should one consider an aftermarket LSD unit?

jimbo1111

Sometimes LS doen't kick in at low speed. Your lsd may still be ok. They don't always work.

User 41221

To answer some the questions here...

Yes, you can convert an open diff to a LSD using either a GT or Torsen aftermarket or factory LSD diff. Its a bit more involved than I care to do, and I have a LOT of experience working on 944's, and the price of failure to install it can be rather high, so I let professionals do my internal gearbox work. I know there are a few guys on rennlist that have done gearbox work themselves, but I couldn't honestly say how successful they were, so if they want to chime in, I'll let them. I do know that I bought a supposedly professionally build tranny, and that guy royally screwed it up, so I am having Kevin Gross (who really DOES know his stuff and will do it right) rebuild the entire thing again.

The factory units can be refreshed pretty easily, by replacing the clutches. Most of the cars with 85+k miles on them have pretty worn clutches and get limited LSD response. If you have a factory LSD that is otherwise working properly, I would definitely stick with it, instead of replacing the whole diff with a torsen unit. The factory LSD, properly set up, is a very nice unit and lots of track guys prefer it over the torsen.

Regards,