I'm thinking of putting a zx9r engine in the back of my clan driving forward onto a sierra diff and out to hubs on trailing arms. I may have to turn the diff upside down to get the direction of travel right. Which diffs are best, I want gearing as high as possible so I'm reckoning that the diff from a diesel would a good way to go. Are there any other diffs that are good to use, Sierra ones are getting rare now. thanks Nigel

Sierra diffs 3.38 and 3.14 another option is the Freelander @ 3.2

Brilliant snapper thanks, freelander diffs may be easier to get in the scrappers, thanks