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

Upper Control Arm Nut Replacement

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Old Apr 15, 2017 | 07:34 PM
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Default Upper Control Arm Nut Replacement

Curious if anyone knows where I can get a replacement nut for my upper control arm. The nylon lock washer broke when I removed it.

Do you think a replacement is needed? Or would red loctite be enough? I called GM and was told the part is discontinued. I went to a few places around here locally, but no one sells any that big with the lock washer.

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Old Apr 15, 2017 | 10:38 PM
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the C4 control arms do not have nylon lock nuts.
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Old Apr 15, 2017 | 10:50 PM
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Originally Posted by THE 383 admiral
the C4 control arms do not have nylon lock nuts.
Then what is it? It has some sort of nylon in the nut.
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Old Apr 15, 2017 | 10:51 PM
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Originally Posted by THE 383 admiral
the C4 control arms do not have nylon lock nuts.
Just a liberal application of loctite red.
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Old Apr 16, 2017 | 09:09 AM
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Originally Posted by ChumpVette
Just a liberal application of loctite red.
Interesting thanks. It sure doesn't look like Loctite though.

You guys are the best!
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Old Apr 17, 2017 | 08:42 PM
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Default Yes, they are nylon lock nuts

I just completed my upper control arms and found that these are M20-2.5 steel nylon lock nuts. I purchased six of them, needed to go online since I could not find any local sources for these either.

I found a vendor on ebay that sells them at a reasonable price. Go to ebay and search for item #222388230672

Good Luck!

Last edited by jpipx; Apr 17, 2017 at 08:43 PM.
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Old Apr 17, 2017 | 08:53 PM
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Originally Posted by jpipx
I just completed my upper control arms and found that these are M20-2.5 steel nylon lock nuts. I purchased six of them, needed to go online since I could not find any local sources for these either.

I found a vendor on ebay that sells them at a reasonable price. Go to ebay and search for item #222388230672

Good Luck!
That's awesome thanks! I could of sworn it looked like nylon lock nuts.
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Old Apr 17, 2017 | 09:05 PM
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Originally Posted by jpipx
I just completed my upper control arms and found that these are M20-2.5 steel nylon lock nuts. I purchased six of them, needed to go online since I could not find any local sources for these either.

I found a vendor on ebay that sells them at a reasonable price. Go to ebay and search for item #222388230672

Good Luck!
I found them at Fastenall, but had to buy them in a pack of 6 (or 8, not sure).
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Old Apr 17, 2017 | 09:24 PM
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I always thought (for this application) the "nylon insert" in the nuts was more of a "sealing device" rather than a locking device due to the use of the dissimilar metals. The bushing/washer provide a seal for the base of the nut.

In very similar nutted (steel/steel) GM would have likely just specified a Prevailing Torque fastener.

Last edited by WVZR-1; Apr 17, 2017 at 09:31 PM.
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