67 rear susp help - Impala Tech
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post #1 of 4 (permalink) Old 11-26-2016, 02:14 PM Thread Starter
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Location: Michigan
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67 rear susp help

O.K guys,

I have a 67 Impala that I bought a few years ago with some mods. It came with a ZZ502, 700R4 trans and a ladder bar suspension, still retaining the factory rear lower control arms, but the rear upper control arms were removed.

I planned on doing a few things to it this winter, so after getting it up on the hoist I gave it a look over and saw that the cross tube that the front of the ladder bars attach to is cracked all the way around where it attaches to the driver's side frame. NOT GOOD! One hole shot away from a catastrophe.

Its a street car, so I'm thinking of getting rid of the ladder bars and going back to the factory setup. When I got the car I also got some parts, including what I thought were the rear upper control arms. Well I measured them from bushing center to bushing center and they measure 10". Sort of measuring from the frame bracket center to the axle bracket center it measures approx. 12". Looking at the Global West website their adjustable upper arms they say are 12-5/8 from center to center. ???

Also the lower control arm bushings are shot and need to be replaced. The access for the front nut seems to be very difficult. Anybody have problems or success with it?

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post #2 of 4 (permalink) Old 11-26-2016, 05:13 PM
Join Date: Jan 2006
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First thing to mention is ladder bars do not belong on the street. They will break suspension and power train parts because they rotate in different arcs than your rear end. If one side lifts or drops while attempting a turn it only magnifies the problem.

Your car left the factory with a modified four link. It is mounted in rubber for two reasons. The upper control links are triangulated which means they also swing on two different planes simultaneously. The rubber was used to prevent the bolt from binding or shearing. In a race car that rubber bushing is replaced with a spherical ball joint that can rotate in two planes at once but since the joint is solid steel you get road noise and vibration transferred into the car.

Rubber is an organic substance (tree sap) and as such it rots over time. That would account for your worn or missing lower control arm bushings.

Now for your problem. The upper control arms changed length from the first year used in 1965 until your car body was discontinued in 1970 (though the triangulated four link suspension was retained up until 1999). I think in 1967 the length of the arms changed from the short ten inch to the longer twelve inch, though I am not sure. Someone more experienced will chime in and provide more info. The arms may have changed from long to shorter ones for all I know. I just know they changed during the production run.

I recommend polyurethane bushings to be used every where on your car except for the upper control arms. In that case I recommend boxing the control arms (both top and bottom) but retaining the rubber bushings in the differential case and at the end of the upper control arm.

Big Dave
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post #3 of 4 (permalink) Old 12-03-2016, 05:04 PM Thread Starter
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Sort of going back to my original questions which no one really answered. Does anyone know the exact center to center dimensions of a 67 Impala rear upper and lower control arms?
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post #4 of 4 (permalink) Old 12-07-2016, 01:50 PM
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I can measure them when I get home today.
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