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Rear suspension bushings on 78-87 models
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jmchevy
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PostPosted: Wed May 28, 2008 12:49 pm    Post subject: Rear suspension bushings on 78-87 models Reply with quote

Whats the best way to check for worn bushings in the rear control arms?
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1BadElky
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PostPosted: Wed May 28, 2008 1:43 pm    Post subject: Reply with quote

look to see if they are cracked or tattered.
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ElCafreak
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PostPosted: Wed Jul 23, 2008 8:21 pm    Post subject: Reply with quote

I've checked mine and there are no obvious signs of cracking or wear, but the drivers side sags 1-2 inches more than the pass side. I just took off the old air shocks and replaced with regular shocks and it still sags.
I'm going to the parts store this weekend and get bushings.
Also, is there a standard hite measurement for the springs? I figure I will check that too while I'm under there.
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toms84ss
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PostPosted: Wed Jul 23, 2008 8:52 pm    Post subject: Reply with quote

Probably the springs are sacked out. If they are the originals I'm guessing thats where the sag is coming from. I dont think you'd get that much sag out of worn bushings. Pull the rear springs out and line them up next to each other. See if there is any free height differnece. You could also swap them to the other side to see if the sag moves around. Easier then changing bushings.
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ElCafreak
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PostPosted: Thu Jul 24, 2008 10:03 am    Post subject: Reply with quote

Hey Tom. How you been? Thanx 4 ur reply. Yea, I'll try that first. All I have to do is unbolt the bottom of the shocks and let the axle down right? Believe it or not, THAT is the only thing I haven't touched on this truck yet. Cool
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toms84ss
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PostPosted: Thu Jul 24, 2008 5:03 pm    Post subject: Reply with quote

That will get the springs out. Just keep everything supported with jackstands and a jack so you dont rip out any brake lines when you lower it.
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ElCafreak
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PostPosted: Thu Jul 24, 2008 5:49 pm    Post subject: Reply with quote

Thanx Dude. I figured that was how you did it. The control arms will keeps it in place and the shocks being unhooked will let me lower it. I'll have to do one side at a time tomorrow morning and saturday morning, as I work nights and it makes everything harder to do. I found a pair of springs at a junk yard for $40.
Thanx again
dug
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toms84ss
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PostPosted: Thu Jul 24, 2008 6:03 pm    Post subject: Reply with quote

Check the local parts stores. You should be able to buy Moog or TRW replacement springs for about the same price. Your just buying old worn out springs from the bone yards.
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ElCafreak
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PostPosted: Thu Jul 24, 2008 7:03 pm    Post subject: Reply with quote

Alright Thanx Dude. Calling now.
Getting the elky inspected this weekend and can't drive it around sagging on one side, know what mean?!
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ElCafreak
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PostPosted: Fri Jul 25, 2008 10:41 am    Post subject: Reply with quote

Ok, I've swapped the springs around and the same side still sags. Put new shocks on too. All that is left are the control arms right? Or am I missing something?
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toms84ss
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PostPosted: Fri Jul 25, 2008 6:22 pm    Post subject: Reply with quote

Check the spring mounts upper and lower. It's possible there may be a problem there. If not then you pretty much ruled out everything except the control arms.
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boboyen
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PostPosted: Fri Jul 25, 2008 6:43 pm    Post subject: Reply with quote

Maybe better put a good eyeball on the frame?
Grab a tape measure & jackstand it on level ground & take a good close look!
I hope not, but you may find a twist or crack??
Good Luck!
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464elky
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PostPosted: Sat Jul 26, 2008 6:40 am    Post subject: Reply with quote

Have you checked the front? If something is holding the right front up then the left rear will be down and etc.
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Steve81OR
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PostPosted: Sat Jul 26, 2008 8:05 am    Post subject: Reply with quote

ElCafreak wrote:
...the drivers side sags 1-2 inches more than the pass side. I just took off the old air shocks and replaced with regular shocks and it still sags.


I have the same issue on mine, the passenger side is lower than the drivers side. I replaced all 4 springs, nothing wrong on the spring mounts that I could see. I was thinking one of the air shocks is inflating more than the other, but I haven't had time to check into it further. Let us know what you find out, this may be more common of a problem than I thought it was.
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ElCafreak
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PostPosted: Sat Jul 26, 2008 8:39 am    Post subject: Reply with quote

Ok. I just got home from work and I'm going out this morning and switching the springs around again just to make 1000000000% sure that I DID switch them. I'm taking the regular shocks back and getting some good Monroe air shocks.
I did have to have the front frame straightened back when I first started working on this thing about 10 years ago, and they checked the whole frame out when they had it.
I did give a real close look at all of the mounts( shocks & springs) when I had it down yesterday, but I'll check it out again 2 day. They both have the rubber that goes between the top of the spring and the top mount too.
It can't really be the control arms. They don't have anything to do with the ride hite, they only help control the axle.
The truck is sitting level too.
I appreciate all of ya'lls input.
I'll check back in later b4 I go to bed.
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