C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

measurement needed please

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Old Sep 7, 2014 | 01:31 PM
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Last night I got my spare rear control arms cleaned up and installed the poly bushings. Did a quick check fit with my new DRM brackets and I find that the brackets are too narrow by about 1/8" for the rods to fit inside.


I don't know if the poly bushings are too wide or the brackets are too narrow, so if someone has a stock set of brackets on the shelf and can measure them for me, I can sort this out and would be very appreciative!


This is the bracket that bolts to the frame and the 4 dog bones (2 each side) attach to.
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Old Sep 7, 2014 | 01:41 PM
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I have one here with bushings replaced in dog bones installed and bolted into the bracket, inside dimension is something 1.66 to 1.71 depending upon where measured.

Hope that helps.
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Old Sep 7, 2014 | 05:06 PM
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Originally Posted by WVZR-1
I have one here with bushings replaced in dog bones installed and bolted into the bracket, inside dimension is something 1.66 to 1.71 depending upon where measured.

Hope that helps.

Thank you sir! Mine are 1.670 inside to inside but the bushings are 1.745 outside to outside - .075 bigger. This is what drives me nuts about aftermarket parts.
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Old Sep 7, 2014 | 08:46 PM
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Originally Posted by mcm95403
Thank you sir! Mine are 1.670 inside to inside but the bushings are 1.745 outside to outside - .075 bigger. This is what drives me nuts about aftermarket parts.
You should be able to make that work. Take two 3/8 bolts and two "long nuts" and use them to spread the bracket so that you can get the bushing started. All lubed up you should be good. You're going to use the 3/8 bolts and long nut like a manifold spreader.

3/8-16 long nuts are everywhere. In the home store chains they're likely called coupling nuts.
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Old Sep 9, 2014 | 12:12 AM
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That was my plan originally. Then when I looked at them carefully I saw the problem - the U was over-pressed so that the uprights of it were over-center. I was able to use my bench vise to gently bend them back to the right shape. Everything else went together fine.
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