The original Mopar strut bushings had a thicker and thinner section (right photo). If this is not done the lower control arm is pushed back causing it to slip on its pivot bushing if polurethane, and/or causing undue wear and reducing caster in either rubber or poly.*
To obtain the thin rear section on a strut rod bushing, it appears one could buy the "Moog Improved", or one can modify a standard polyurathane (or rubber) A/E body set as shown below.
Note: there was also a one piece rubber bushing that originally came on most if not all a-bodies. It wasn't much fun to remove, and apparently was not used as the prefered replacement even by Mopar.
|Top Drawing - Strut Position in K-Frame:
Reaction strut installed without the front bushing assembly. to determine The frame thickness and space available for bushings on each side of the frame was measured.
Middle Drawing - Strut Bushing Assembly Hardware:
Bottom Drawing - Unmodified Poly Bushing Installed:
|It seemed important to keep some of the cone shape for good assembly fit. As these parts were clearly not engineered specifically for the A-bodies, whether all the extra thickness was really needed is not known. My decision from several trials was no. So, about half the thickness to be removed was sliced off the cone side and half off of the full diameter side.||The full diameter part was moved to the front half of the assembly. Also some of the original shoulder was sliced and that was saved for the spacing through the frame if it was needed.|
* A lower control arm being pushed off a nylon bushing from a too thick strut bushing can be seen at www.Firmfeel.com. They offer an adjustable strut rod as an alternative way to get the same results I did.
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Handling Theory for late-'60s to mid-'70s Mopars
If you take advice, or copy something I have done, you are on your own. I'm just trying to be helpful. You need to make your own decisions, and know about or discover the risks before barging ahead on any endevour.
copyright Mathew Grubel, December 10, 2003
2nd edition. February 28, 2004