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Old 09-08-2020, 01:13 PM   #1
sick472
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Replacing Upper A-Arm Bumpers

I have new A-arm bumpers coming and wanted to ask if there is any tricks to installing these with the suspension in tact. I'm really hoping to not have to take the springs out and such. The old ones pretty much just crumbled out on their own. They were past due.

72 C10
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He who is without oil shall throw the first rod. Compressions 8.7:1

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Old 09-08-2020, 01:48 PM   #2
Willys_MB
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Re: Replacing Upper A-Arm Bumpers

They’re super easy. I threw a little Vaseline on mine and they popped right in. If they’re stubborn you can heat them up GENTLY with a heat gun!
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Old 09-08-2020, 02:43 PM   #3
Wizo
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Re: Replacing Upper A-Arm Bumpers

Smidge of Dawn dish soap.
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Old 09-08-2020, 09:19 PM   #4
Peanut74
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Re: Replacing Upper A-Arm Bumpers

dish washing soap works great. Just got done doing mine super easy.
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Old 09-09-2020, 09:21 AM   #5
sick472
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Re: Replacing Upper A-Arm Bumpers

Thanks for the boost in convenience! It just looks awful tight in there and rubber doodads can be a pain.
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He who is without oil shall throw the first rod. Compressions 8.7:1

1972 C10
1976 C10 (parts truck)
1985 K20
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Old 09-09-2020, 10:43 AM   #6
ltdmstr
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Re: Replacing Upper A-Arm Bumpers

Had mine out when I rebuilt the front end and tried to replace the old ones with new CPP urethane bumpers. Simply couldn't get them in. Tried soap, wax, bunch of other stuff. No go. Ended up cleaning the stock pieces and reusing those. Went in with no problem. The knob that fits through the hole on the a-arm was a bit smaller on the stock pieces, and the rubber is a bunch softer, so that's probably why.
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Old 09-09-2020, 12:04 PM   #7
sick472
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Re: Replacing Upper A-Arm Bumpers

I suspect the old bumpers were original and when I refurbished the suspension... they were removed, cleaned up, and re-installed in good order. 20 years later (I know) they were dry rotted to the point that I looked at one and it disintegrated.

Just goes to show you what can happen to rubber even if kept garaged over the years. I think I will check the 20 year old NEW poly cab mounts too. I'd hate to have one of those disintegrate while taking a corner.
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He who is without oil shall throw the first rod. Compressions 8.7:1

1972 C10
1976 C10 (parts truck)
1985 K20
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