When designing a 4 link rear suspension, where do you "ideally" want to setup your Instant Center? From what I have read here, it seems that you want the side view of the uppers and lowers to converge at the COG? Is the center of the flywheel a good indication of the COG?

Is it better to have it way out in front of the COG and as low as possible to help reduce anti-squat?

Where did you set your IC and how does it work?

eric try to aim it at the pilot bushing that seems to be a good balance . it is nearly ipossible to find the exact cog in a vehicle so a good place to guess the cog is the middle of the flywheel .
remeber an instant center above the cog will cause the rear to lift and one below does the opposite.
use carpenters string to lay out your links to see where these points end up . dont forget about roll centers and roll axis

good luck

alan

Thanks Alan.

That is what I was thinking. I have my frame and links drawn up on AutoCAD so I can change things as needed before I go make anything. I am thinking of making the upper links converge at the to of the diff and have them angle outward to the top of the inside frame rails. The lower links will be at the outside edge to the housing and angling in towards the outside of the frame (not too much angle). The roll axis will not be flat, but it won't be too steep either (aobut 8*upward). The upper links will be about 45" long and the lowers will be about 43" long as viewed from the side. This should rotate the pinion up a few degrees as the axle droops.