I'm going to say POLY! Energy suspesion bushing kits are cheep and they work well! I'm a stock LS1/4L60E and I can pretty much spin the tires as long as I want to with NO wheel hop! It doesn't really matter what tire as well. I had all but no wheel hop with the T2 rear end and now with the 8.8 swap I have zero, nadda, not even an little bit of hop. Oh and I just put struts in the car 2 weeks ago, and now its even better!
Things that will help in stabalizing the rear end:
FC, running a T2 rear with the clutch type diff, "929" axles are better then the T2 axles. 929 axles have 30MM center bars rather then 27 MM like the T2. It eliminates axles wind up and allows for a more fluid transfer of power then the the T2 axle. If you can get rid of the wind up issue you will get much less wheel hop. Anything you can do to eliminate movement in the rear end is also a plus. Pinion snubber wether is rubber or welded will do alot as well. Adjustable links in the center section of the wishbone will allow you to set camber and square up the footprint of the tire. this is huge since most FC's dont have a factory adjustment for this!
I'm now running an 8.8 with the Tbird diff, 3:27 gears and DSS axles and I have NO wheel hop at all at any tire speed!
Just some food for thought!
