for around $600-$700, you can buy a spool, axle, and c-clip elim kit for your 8.5 and not have to worry about doing a 9" at all. i had a mini spool on a street driven car (granted, it was in the 7.5 i had). it was starting to twist the center blocks out of the side pieces after just 250 miles and 5 passes down the track.
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