4.777:1 and good luck. No other manufacturer runs 4.777 and if you go anything different in ratio then you need to match it to the front as well.

Nearest I have come across in many hours of research is a Rover diff at 4.75 which would pretty much require custom everything (given all Rover rear axles are offset). If you want to get serious, SAS and match front to rear.

2002 Sporty , Ironman 2.5" spring, 2" body, 15 x 7 ROH wheels, K&N, 15 x 10.5 Simex Centipedes, Powerchip 91.

"Never argue with an idiot. They will bring you down to their level then beat you with experience!"