not really sure about this, apparently my LSD is not working because both wheels should spin when one is spun,
how would i go about fixing this, replacing or rebuilding? or is my car meant to only let one wheel spin at the same time.
can someone please help and give me some advice?

Thanks

 

if you're talking about when it's up on jacks, if you spin one wheel, the other wheel should spin the opposite direction because it isnt under load.

 

What Sabre said. They both should spin in opposite directions if up in the air.