Chevy v.s GMC truck A-arm lengths? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-08-2004, 07:12 PM
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Chevy v.s GMC truck A-arm lengths?

Does anyone know if the A-arm lengths between Chevy and GMC trucks are the same? I have an 87 R10 1/2 ton shorty and used parts from an 87 GMC 1/2 tom wrangler. Upon reassembly I noticed a large degree of (caster?) inwards at the top as if there wasn't enough shims or one of the a arm lengths were wrong. I reinstalled the old shims, but its not even close. I forgot to put the bump stops back in on the top arms, but I can't see that helping. If anything I think it will get even worse once hanging more weight back on the truck. The only difference I noticed was the GMC had 1/4" thicker rotors so i kept those. Did GMC have a heavy 1/2 ton?? Please help, something is not right here....Thanks in advance.

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Old 08-09-2004, 05:00 AM
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The suspensions are identical. Make sure you didn't get the arms swapped from side to side... That would cause the problem you are describing.
Mark
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Old 08-09-2004, 12:56 PM
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Yikes!...I dont think I did that, but I'll check as soon as I get home...Will it even go together like that?? If I did, I will muster the courage to admit it......Thanks
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Old 08-11-2004, 08:35 PM
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I tried to post a pic, but the file size was too large. anyone know how to resize an image or should I take another photo with less resolution??
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Old 08-15-2004, 12:44 PM
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Duh!! I just looked at the top A-Arms and noticed that the ball joint sits forward of the lower and that there is a hole for the brake hose clip that is on the opposite of the caliper location.....Yup, the top arms are on the wrong sides...Just call me Dumb A**! Well if I have to dissasemble it, nows the time for dropped spindles...
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Old 09-09-2004, 10:04 AM
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I'm gonna re-neg on the "I'm a *******" comment. The arrms are in the right places. The brake line hole corresponds to the location where it passes through the frame for the top arms. The lower arms are correct due to the fact the sway bar connection is also in the right spot. Now I'm back to being miffed as to why I need a truck load of shims to correct the tipped in angle of the wheels. (2-3 times more than what was there originally) I'll let the alignment guy worry about it I guess.
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Old 09-10-2004, 11:15 AM
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The tipped in angle of the wheels would be negative camber. If you used the upper and lower control arms off the donor vehicle it is possible there is that much variance between the two vehicles or a component (spindle, control arms) could be bent. If a component is not bent then that is why vehicles were designed for shims, to bring in the proper camber and caster.
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