Which one ??

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Poly bushings are good everywhere EXCEPT the rear, upper control arms, frame side. Solid upper bars work best in a solid, spherical mount.
Are the upper front and rear bushings the same size? I didn’t think they were. I have found spherical bushings for the axle but not the frame side. Maybe I didn’t dig deep enough to find them.
 
I've seen some bits of this argument before, between the same two members. :roll:

Only here we're confusing some issues. The problem with binding on the rear upper control arms is caused by a stiff sway bar that attaches to the lower control arms, not by your choice of bushings.

The comparison of rubber to polyurethane is an urban legend. Take a polyurethane mount or bushing in your hand. You can squeeze it with your bare hand.
So if I got rid of my control arm mount sway bar should I go with the frame mount to axle mount bar? Then the rear shimmy will go away? I have a rear hitch that I will be putting on it also.
 
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This thread is getting more interesting by the day... I like it. I'm probably going to go with rubber mounts/bushings everywhere. Comfortable stock style ride quality. Don't care how long they last. That will be somebody else's problem.
 
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So if I got rid of my control arm mount sway bar should I go with the frame mount to axle mount bar? Then the rear shimmy will go away? I have a rear hitch that I will be putting on it also.
What exactly is "rear end shimmy"?
 
To be honest, I don’t know. Lack of a better term? A few times driving, around 55-65 mph, going over a dip in the road the car just swerved. I could tell it came from the rear. It is a very weird feeling. It doesn’t do it around curves or flat road. So I don’t know what it is. Looking to you guys for help.
 
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So if I’m reading and understanding correctly, the poly bushings bind and the rear 4 link doesn’t do or react how it supposed to. Would spherical bushings in the top axle points and the axle to frame mount sway bar be the solution? I have poly bushings at all points with tubular arms, top and bottom, in the rear of my car and sometimes it does some crazy stuff. Like the rear of the car just pulls the car to one side or the other and freaks you out.

Those plus roto joints on at least the axle end of the LCAs should fix most of the binding issues. LCAs with double end roto joints will work too, just a little more NVH. The upper control arms have wonky travel arcs and the stock rear sway bar causes some binding, being a low cost design.
 
I really should start my own thread, sorry op.
 
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To be honest, I don’t know. Lack of a better term? A few times driving, around 55-65 mph, going over a dip in the road the car just swerved. I could tell it came from the rear. It is a very weird feeling. It doesn’t do it around curves or flat road. So I don’t know what it is. Looking to you guys for help.
Ball joints would be my first suspect.

My Bonne would wave the rear end after a bump on a turn; all 4 rear body mounts were trashed. I fixed that, and it was much better. The addition of a rear sway bar helped more after that.
 
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Ok, it just occurred to me that I may have hi jacked this thread and didn’t intend to do that at all. I apologize to everyone involved if this is the case. Fleming just said his body mounts caused some of the same issues I am having, which is the original main topic. Everything has to work together in order to function properly. I have new ball joints in the front. So everything is new except for the body mounts and it sounds like those need replaced as well as replacing some of the other parts I put in for everything to work as it should.
 
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