so, I still don't know what the option "locking rear differential is"
 

Can someone explain it to me. Thanks

Lou

Well, in 4x4 terms, a locking diff mechanically ties the two axle shafts together, so they will NOT turn separately.

is it manual or electronic? Basically, one wheel spins at low speed the other turns in order to get traction, good for those snowy days. Common in off road vehicles.

From what I understand it was the name used to refer to a "limited slip differential".

I copy you the explanation of the rear diff lock(LSD) i try to make on another forum times ago..:confused:

I try to explain..but i don't know if i'm able..

Without LSD the wheel that loose grip take all the power and the one with more grip as "no" traction,imagine on a left turn:the left rear wheel will loose traction becouse the weight go to the right side of the car and the right rear wheel have traction,but WITHOUT LSD the power go to the left rear wheel that is "easier" to let turn

With LSD the rear wheels try to make the same turn(the left and the right one) so if you make a left turn,with the LSD the right rear wheel don't loose turn becouse take more traction,but remain with the same turn of the left weel that have loose traction(all the two wheels make same turn and the most importand you don't loose traction) ...so if you make a drift,is easiest to stay in drift becouse you don't loose traction on the rear wheels..

Maybe is not clear..but in Italian is easy for me to explain..

Understand?

NO!

HAHAhilarious

It's a security device ;)

How's this for a stupid question. I ordered limited slip differential on my car, I've had it about two weeks and I have no idea if my car has it. It says I have it on the invoice and the window sticker but, I can't tell. I was told it was good to have and I think I do but, is there a way I can tell. Try not to make me feel too stupid with your reponses.

Well, you can't tell until you push the car to the limits. W/ LSD, let's say you go around a turn and your rear left looses traction your rear right wheel will start grabbing power from the left in order to grab traction.

Or jac up the rear, spin on wheel, the other wheel will stay still until you are about half way around then will start spinning.

put car in gear, jack up rear of car, turn one wheel. if the wheel on the other side turns in the opposite direction proportional to the amount you are turning the wheel on your side then you DO NOT have limited slip. If on the other hand, the wheels seem to spin independently, your car is equipped with a LSD.

you are actually suppose to keep the car in neutral

From my experience, having LSD really helps make a difference. I drove a 997TT with LSD in Austria on all sorts of different types of roads. And then I test drove a 997TT without LSD here in the states. I didn't feel as "confident" driving the car without LSD especially in the corners. It didn't feel as "planted" to me.

I quite understood you Darius...but please tell me in italian! hilarious If I can ask you...

Really? That doesn't make much sense, because then it would be possible to spin the transmission output shaft, etc.

With the car in gear, the only thing that could possibly spin when you turn one wheel would be the other one because the compression of the motor is holding everything else still.

I've used this method and I've yet to be wrong...:confused:

after holidays..hilarious

i was reading the post on lsd , and it got me thinking as i bought the car used with 5k miles and the factory invoice said it has diff lock , so when the car is in gear the wheels turn oppposite, in neutral they turn freely, hmm did i get ripped off??