I just installed a 3 Link Rear Suspension on my MK II roadster. The instructions state that they usually run about 2 degrees up on the rear axle, but you can adjust this to fit your particular set-up. If I am remembering right in the past when I helped out with some Hot Rods and Race Cars we always set the differentials to a positive (up angle). I read through a number of old posts in the Forum on this subject and a lot of members recommended a 2 degree negative (down angle). My Cobra is used mainly for street driving. I would like to hear from anyone that has an opinion on what I should set my differential at.