I have an 08 ISF , OEM diff, I've noticed that some times it seems only 1 tire is spinning, like I turn and have to floor it , only 1 tire spins...is this normal? or is there something broken or wore out?, when straight line accel and gear changes both spin as the car will tend to get a ;
little sideways

 

That's just how an open differential works. The power goes to the wheel with the least traction. I don't think anything is "wrong" in your case.

 

Nothing is wrong. It's doing its job, but as others have said in previous threads and even Lexus in adding the mechanical LSD, the upgrade makes a big difference.

 

it sounds like it would....may shop around for a 2010 diff

 

Good luck. I've been looking for one over a year now and they are either way overpriced (more expensive than os giken unit) or snapped up immediately.