Some tips on that trailing arm main link bushing:

Cut out the middle with a razor...and it's kinda of a pain.

Torch off the rubber, scrape the rest off with a screwdriver or knife.

With the Bushing having been put in the freezer to harden...spray it with lithium grease, slide the center link bar in the bushing...then put it and the trailing arm in a vice, press the bushing into the trailing arm...you have to be creative because it's kinda hard with the center bar there.

But it should go in fairly easily once you figure it out.

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