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Old 06-10-2010, 07:58 PM   #1
JGross
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Have you ever seen a trailing arm modified like this?

I started taking the rear suspension apart to change the trailing arm bushings and I found that the drivers side arm had been modified. I don't see any damage to the arm so I don't think its a repair. Do you think I should replace it just in case?







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Old 06-10-2010, 08:01 PM   #2
fixit-p
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Re: Have you ever seen a trailing arm modified like this?

looks like a 3/4 ton TA
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Old 06-10-2010, 08:04 PM   #3
Rich 5150 69
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Re: Have you ever seen a trailing arm modified like this?

You might want to put a string on it from several differant angles and compare it to the other one, for straightness / lenght from end to end...just a thought.
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Old 06-10-2010, 08:09 PM   #4
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Re: Have you ever seen a trailing arm modified like this?

CPP actually makes a plate set for doing this down the entire length of the arms for reinforcement. I certainly wouldn't get rid of it because of the plate.

http://www.classicperform.com/Store/...k/6072TARK.htm
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Old 06-10-2010, 09:13 PM   #5
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Re: Have you ever seen a trailing arm modified like this?

it may have started to split apart and a po had it plated to fix a soon to be prob
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Old 06-11-2010, 01:00 AM   #6
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Re: Have you ever seen a trailing arm modified like this?

I agree.....My '66 C20 has trailing arms that are like that, and I've seen a few other C20's like that as well.

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Originally Posted by fixit-p View Post
looks like a 3/4 ton TA
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Old 06-11-2010, 01:01 AM   #7
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Re: Have you ever seen a trailing arm modified like this?

I have seen a number of them, mostly on C20 Custom Camper trucks, so it may have been a dealer-installed option, for the heavier load-carrying capacity for the cabover campers.
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Old 06-11-2010, 01:25 AM   #8
cb1965
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Re: Have you ever seen a trailing arm modified like this?

here's mine. it's a c20



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Old 06-11-2010, 01:42 AM   #9
66coffin
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Re: Have you ever seen a trailing arm modified like this?

my c20's got 'em too.
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Old 06-11-2010, 06:33 AM   #10
raycow
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Re: Have you ever seen a trailing arm modified like this?

Yah, but JGross's arm looks like it is spot welded instead of riveted.

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Old 06-11-2010, 07:35 AM   #11
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Re: Have you ever seen a trailing arm modified like this?

I believe the plates that you guys have riveted to the trailing arms are a factory design modification. I speculate that GM had problems with these trailing arms spliting so this was the fix.

I base that upon my own experience with my trailing arms and also based on the following link and the picture below from the 67-72 forum:

http://67-72chevytrucks.com/vboard/s...light=trailing

Pictures below are GM built arms and they have welded plates.

Per a post on the thread I reference above:

Quote:
Originally Posted by gcburdic View Post
Hey guys....

A friend of mine has some trailing arms with a GM part #3881314...but is not sure what vehicle they are for....Can someone tell me what year they are for??

I tried to google search the part number and looked at a couple site, but got no results....

Thanks for any help....
Quote:
Originally Posted by Classic Heartbeat View Post
This is what the GM Master Parts Catolog says:

60-64 series 10 (exc. leaf spring 4/WD)
60-70 series 20 (exc. leaf spring 4/WD)
68-70 series 10-20 (exc. leaf spring 4/WD)
71-72 series 10-20 (Conv., DD) (exc. leaf spring 4/WD)

So in otherwords it fits everything from 1960 to 1972 C/10 & C/20 with rear trailing arm suspention. WES
(lakeroadster comment: 65-66 series 10 isn't listed ?)
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Last edited by lakeroadster; 06-11-2010 at 07:52 AM.
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Old 06-11-2010, 08:37 AM   #12
72freak
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Re: Have you ever seen a trailing arm modified like this?

The trailing arms in the 60's had a bad habbit of cracking or splitting and this was a VERY common repair. The one I have was called back to the dealer and welded (plated or boxed)there...according to original owner.
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Old 06-11-2010, 11:46 AM   #13
JGross
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Re: Have you ever seen a trailing arm modified like this?

Thanks for the input, I think I will go ahead and add some support plates to the other arm.
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