Err, no the dealer is talking bu**shit. The diff always drives both rear wheels, irrespective of whether it is open, or has a limited slip diff. With both an open diff and a limited slip diff the drive will be transmitted equally during normal driving.


The difference between open and Limited slip diff is essentially this:- If the diff is open, and you jack up one rear wheel leaving the other on the ground the diff will transmit all the drive to the wheel that is free to turn.

If you have a limited slip it will transmit some of the drive to the free wheel , and some to the wheel that is on the ground how much depends on how fierce the LSD is. Ergo the car will be capable of driving itself of the jack. Now imagine one wheel is on ice, one on tarmac.

The rear wheels need to be able to turn independently, since when you corner they describe a different arc. If the diff was completely locked, you'd end up with awesome tyre wear as one wheel was forced to spin whilst the car is turning.


Regards


Pete