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Rear Chrome Bumper Install Advice

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Old Jan 29, 2014 | 09:20 AM
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Default Rear Chrome Bumper Install Advice

I'm working on a 1970 and when I removed the rear chrome bumpers, they were only held on by the two rear bolts (frame extension mount and the 'S' bracket mount). When I installed one of the chrome bumpers yesterday, I used the remaining mounting holes and even though I was careful, I still cracked the paint at the mount that uses the frame extension and the mount located on the side of the car. Now this is an old re-paint and at this time, the cracks are small but my questions is, should I leave it as is or should I use some type of rubber/foam spacer to help cushion the mount and avoid further cracking once I start driving the car?

Thanks for the help, Eric
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Old Jan 29, 2014 | 10:21 AM
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I made a gasket for it and didn`t touch the bare paint attach point
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Old Jan 29, 2014 | 10:24 AM
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There were no factory cushions between the paint and the bumper (at least in '70 anyway), but I'm considering installing them also. I'd like to maintain an original look without cracking the paint. On the rear perhaps something small enough to be hidden by the mount bracket. On the ends ... I'm not sure. They would be difficult to hide.

Please post what you decide.
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Old Jan 29, 2014 | 11:18 AM
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I'm wondering if nylon or Teflon would work....either buy it precut from a home-improvement store and trim it to fit----or buy a small "sheet" of it that is the thickness needed (clear/white/black) and cut it to the proper shape.
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Old Jan 29, 2014 | 11:20 AM
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you cant find mine even if you were looking for one...and why worry a gasket was not OE there, so why look. I think I used 3M trim cement to hold the gasket to the bumper and the thickness was that of the water outlet gasket...{thermostat housing to some}....I wasn`t about to *** my paint up

but whatever......
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Old Jan 29, 2014 | 11:40 AM
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The bumper mounts should only put pressure (have contact) on metal brackets/braces. You need to use metal shims, where necessary, to have ONLY metal-to-metal contact. The body is not supposed to be used as a support for the bumpers.
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Old Jan 29, 2014 | 12:26 PM
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Originally Posted by 7T1vette
The bumper mounts should only put pressure (have contact) on metal brackets/braces. You need to use metal shims, where necessary, to have ONLY metal-to-metal contact. The body is not supposed to be used as a support for the bumpers.


1970 doesn't have the side brace like the 71-73's had.
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Old Jan 29, 2014 | 03:34 PM
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Well....now you know why they were added...
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Old Jan 29, 2014 | 03:39 PM
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Originally Posted by 7T1vette
Well....now you know why they were added...
Yep, I sure do and I even thought about adding them since I think it was a good idea
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Old Jan 29, 2014 | 06:23 PM
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I cut a gasket from an inner tube and glued it on the bumper before I installed it. You can't see it, either.
If your paint is cracking, you're pulling on the fiberglass Reshim and align the bumper until you can tighten the bolt without stressing the body.
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Old Jan 29, 2014 | 07:57 PM
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Originally Posted by Mick71
I cut a gasket from an inner tube and glued it on the bumper before I installed it. You can't see it, either.
If your paint is cracking, you're pulling on the fiberglass Reshim and align the bumper until you can tighten the bolt without stressing the body.
I agree with this statement. The bumpers are off now, so once I find a gasket, I will attempt to re-install them. Thanks
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Old Jan 29, 2014 | 10:10 PM
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I'm only familiar with the '68, but I was planning to use rubber washers...at least on the outboard mounts that do not have a bracket...maybe on all points of contact?
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