Quote:
Originally Posted by KoolBRZ
Those bolts would help take up the slop in the holes, but they don't address the uneven mating surfaces between the body and the top plate of the subframe bushings as well as the support arm to body connections. These surfaces aren't planed flat nor are they perfectly parallel. The rigid collar's cone actually helps support the bolts, and prevent shearing, while the washers actually lock the mating surfaces together.
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Uneven mating faces?? The body is a pressed steel welded construction that is built on a jig. Every assembly in the world requires tolerance, hence the clearance on the holes.
The bolts on the rear subframe pull up through machined steel tubes mounted in rubber bushes. Any angular misalignment of the mating faces is taken up by this rubber. Even if you fit uprated bushes, the bolts will still pull the bush square with the body, and the rigid collar will squash evenly, giving the same result.
As for the front subframe.. how on earth can a solidly bolted component, being removed and bolted solidly back into place with what is no more than an aluminium washer improve ride or jounce??? in fact, I would say that shock loads through the stock assembly are less likely to move anything if they don't have an aluminium washer in place??