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Installing shims on offset trailing arms?

Wilkinshc

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Dec 4, 2004
Messages
242
Location
New Mexico
Corvette
1965 Coupe
I am installing shims on new offset trailing arms and have two problems:

1. I am trying to install the same width shims as I took out but I can not get no where the size in. I am figuring that the new bushings are wider then the old ones and I am reducing each side by the same amount and squeezing the most I can get in. Is this the best idea?

2. The inside amount of shims are about twice the outside but with the offset trailing arms, the arms are hitting the shims. Should I lift them to the top so they don't hit or cut them shorter so they don't hit, or is there something else I should be doing?

any other tips anyone might have on installing the trailing arms?

Thanks for any help guys.

Chuck
 
Joined
Nov 11, 2001
Messages
5,980
Location
SouthCentral Ontario
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www.67HEAVEN.com
Chuck,

I'm puzzled by the problem. When I installed offset trailing arms, I used new shims, but exactly the same width as the original shims. When I went for an alignment, it was almost dead on.

I drilled small holes in the frame to permit the use of a cotter pin (like they started doing in the C3's) through the frame and shims, holding the shims in place. I got the hole location from a C3 frame and it resulted in the shims sitting very low down in the "box".
 

paul67

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Mar 2, 2003
Messages
1,113
Location
Ontario, Canada
Corvette
1974 convertible
The shims should sit below the arm and as noted can be held in place by a long cotter pin. Here is my setup with the cotter pin in place.

 

Wilkinshc

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Joined
Dec 4, 2004
Messages
242
Location
New Mexico
Corvette
1965 Coupe
I measured the bushings and the width of the old ones were 2 5/16 and the ones are 2 1/2.

Also my shims that I recieved from volunteer vette are rectangler in shape and a lot longer then the ones pictured in pauls67 post.

So I need to order new ones or cut these down. Where do you get the shorter shims from?

Thanks
Chuck
 

paul67

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Mar 2, 2003
Messages
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Location
Ontario, Canada
Corvette
1974 convertible
Do your shims look like this? Or do they have holes at each end. If the latter, the trailing arm bolts have to be removed each time you do an alignment.

 

61 Silver

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Dec 27, 2001
Messages
871
Location
Wyoming N.Y.
Corvette
1961 270HP and 1963 340HP
Do your shims look like this? Or do they have holes at each end. If the latter, the trailing arm bolts have to be removed each time you do an alignment.


When I set up the trailing arms on my 63 I use the 1/16" first style shim with double holes on each side of the trailing arm. I then used the second design shim with the slot to fill the space during the alignment process. I then used plastic tie wraps through the end holes to secure the shims. If I decide to have the car judged I will just cut the tie wraps.

Ray
 

Kid_Again

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Jul 6, 2004
Messages
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NJ - Which exit you from?
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65 SB Roadster, 66 BB Coupe
Can't help on the technical side but I used shims that had round holes at each end. I then cut a diagonal slot going from the center and ending at the hole on one end only. That allows me to drop the shims in from the top and pulling on it locks it into place. Looks stock from the bottom. Never fall out, no ties, no nuthin. But that's for my C2s.
 

61 Silver

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Joined
Dec 27, 2001
Messages
871
Location
Wyoming N.Y.
Corvette
1961 270HP and 1963 340HP
Can't help on the technical side but I used shims that had round holes at each end. I then cut a diagonal slot going from the center and ending at the hole on one end only. That allows me to drop the shims in from the top and pulling on it locks it into place. Looks stock from the bottom. Never fall out, no ties, no nuthin. But that's for my C2s.

Great idea!

Ray
 

Wilkinshc

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Joined
Dec 4, 2004
Messages
242
Location
New Mexico
Corvette
1965 Coupe
Can't help on the technical side but I used shims that had round holes at each end. I then cut a diagonal slot going from the center and ending at the hole on one end only. That allows me to drop the shims in from the top and pulling on it locks it into place. Looks stock from the bottom. Never fall out, no ties, no nuthin. But that's for my C2s.


Sorry but I am not following you, can you post a pic?

Thanks
Chuck
 

Kid_Again

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Joined
Jul 6, 2004
Messages
1,171
Location
NJ - Which exit you from?
Corvette
65 SB Roadster, 66 BB Coupe
I'm a bit unfocused now since I just resigned from my current job:J . It may take some time for me to sober up.

Maybe this will help. Picture a shim which has two holes punched on either end. Starting at one of the bolt holes, use a cutting wheel to elongate the slot at about a 45* angle towards the center. The slot has to be at least as wide as the bolt hole. Now, you have a 45* slot cut in one end of the shim. Insert the shim from the top of the trailing arm, it should catch about 1/3 of the way up the shim. When you drop the shim onto the pivot bolt, you pull it towards the back of the car and it slides down and locks. I'll see if I have one made up tonight when (if) I get home.

Lesse here, 8AM, time for a Martini.:m
 

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