[302 LX Eric]

What kind of additive should I use with a stock traction lock in a 8.8??

Ford Friction Modifier - available at your local Ford dealership.

Anyone have some tricks for getting the upper control arm bushings out??

I drilled mine out with a 1/2" Milwaukee drill and 1/4" bit.

Also, What purpose is the chunk of cast iron mounted to the center section?? Is it a vibration dampner?? And do I need it?? This 8.8 is going to replace the 7.5 in my 82 GT.....Thanks for your help...

This 'dog-bone' shaped piece is a vibration dampner and, no you don't need it if you're switching from the stock gear set. If you're keeping the stock set, then supposedly this piece helps to eliminate driveline vibrations.

Hope this helps,
E