Gearbox refurb improve performance?

[J9HHY]

Looks like I may need to get Gearbox re built. Can I have it built to improve performace? Not looking to spend any extra than a re build. What can be done? Could I get 0-60 down to 5.5secs? Lower 0-100 time to?

 

[sideways danny]

put a 182 diff in. A fresh box will give you less drivetrain losses so you'll get more power to the wheels (a few bhp)