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Tubular Rear Control Arm Question

  • Thread starter Thread starter 85foxman
  • Start date Start date Aug 14, 2015

85foxman

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Nov 24, 2012
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Aug 14, 2015
#1
  • Aug 14, 2015
  • #1
I just installed a 8.8 in my 85 GT and it came with upper and lower tubular control arms. I know they stiffen things up but my car no longer has suspension movement. It's very rough riding...I have the same springs that were on my stock 7.5 and stock arms and it rode fine then. Any ideas on where to start looking for my issue? Thanks in advance.
 

Shakerhood

20+ Year Stangneter
Oct 28, 2004
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Aug 14, 2015
#2
  • Aug 14, 2015
  • #2
Did you torque the bolts with the weight of the car on the ground?
 

85foxman

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Southwest Wisconsin
Aug 14, 2015
#3
  • Aug 14, 2015
  • #3
I was told to rest the axle on stands to compress the suspension and tighten everything up so that's what I did
 

Boosted92LX

It's only an inch or two. What's the big deal?
15 Year Member
Dec 19, 2010
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Aug 15, 2015
#4
  • Aug 15, 2015
  • #4
85foxman said:
I just installed a 8.8 in my 85 GT and it came with upper and lower tubular control arms. I know they stiffen things up but my car no longer has suspension movement. It's very rough riding...I have the same springs that were on my stock 7.5 and stock arms and it rode fine then. Any ideas on where to start looking for my issue? Thanks in advance.
Click to expand...

It no longer has ANY movement? ... or it's just tighter? Do the new control arms have steel spherical rod ends, or poly bushings? Switching over to either is going to make a world of difference from worn out 1985 rubber bushings, so some major stiffening is to be expected. If you have literally zero suspension movement, we need to regroup and reassess bud.
 

85foxman

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Aug 15, 2015
#5
  • Aug 15, 2015
  • #5
They are poly bushings...much much much tighter...when my car is sitting on the ground I can not compress the suspension by putting my weight (180lbs) on the rear.
 

Boosted92LX

It's only an inch or two. What's the big deal?
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Aug 15, 2015
#6
  • Aug 15, 2015
  • #6
85foxman said:
They are poly bushings...much much much tighter...when my car is sitting on the ground I can not compress the suspension by putting my weight (180lbs) on the rear.
Click to expand...



Ok. On the inside of those poly bushings should be a steel insert that looke like a piece of tubing or pipe for the bolt to pass thru. It's purpose is to keep the mount from crushing and binding the control arm where it can't swing. Did you leave those out, or not get them with your parts? Very important pieces here.
 

85foxman

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Aug 15, 2015
#7
  • Aug 15, 2015
  • #7
The metal inserts r in the bushings
 

Boosted92LX

It's only an inch or two. What's the big deal?
15 Year Member
Dec 19, 2010
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#8
  • Aug 15, 2015
  • #8
85foxman said:
The metal inserts r in the bushings
Click to expand...

Well, it will loosen up the more you drive it. For what it's worth, I just walked out to the garage and pushed down on my spoiler and moved my car an inch only. I tip in at 275lbs.. so..
 

85foxman

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Aug 15, 2015
#9
  • Aug 15, 2015
  • #9
Boosted92LX said:
Well, it will loosen up the more you drive it. For what it's worth, I just walked out to the garage and pushed down on my spoiler and moved my car an inch only. I tip in at 275lbs.. so..
Click to expand...
Ok I will drive it a while and see what happens. These were in a car for approx 500 miles so I guess it could be they need to "break in". Thanks for the info
 

Boosted92LX

It's only an inch or two. What's the big deal?
15 Year Member
Dec 19, 2010
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224
Aug 15, 2015
#10
  • Aug 15, 2015
  • #10
85foxman said:
Ok I will drive it a while and see what happens. These were in a car for approx 500 miles so I guess it could be they need to "break in". Thanks for the info
Click to expand...

Don't hold me to them "breaking in"... but logic would say they would loosen up a little. There are countless posts here about the amazing difference poly bushing make for chassis stiffening, so there's that. My experience isn't as drastic as yours, but again, I'm no featherweight, lol. Sorry I couldn't be of more help.
 

85foxman

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Nov 24, 2012
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Southwest Wisconsin
Aug 15, 2015
#11
  • Aug 15, 2015
  • #11
Boosted92LX said:
Don't hold me to them "breaking in"... but logic would say they would loosen up a little. There are countless posts here about the amazing difference poly bushing make for chassis stiffening, so there's that. My experience isn't as drastic as yours, but again, I'm no featherweight, lol. Sorry I couldn't be of more help.
Click to expand...
Thanks for the info...I'll drive it a while and see what happens...I could be just paranoid haha
 

RangerJoe

I leave the horn on while driving
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#12
  • Aug 15, 2015
  • #12
Did you grease them? What brand?

Joe
 

85foxman

Member
Nov 24, 2012
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Southwest Wisconsin
Aug 15, 2015
#13
  • Aug 15, 2015
  • #13
RangerJoe said:
Did you grease them? What brand?

Joe
Click to expand...
Yes I greased them and I believe UPR? I'm not 100% on the brand.
 

squeak93

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Jun 2, 2005
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Aug 17, 2015
#14
  • Aug 17, 2015
  • #14
The poly will be considerably tighter than worn out stock stuff w/25 yr old+ rubber bushings. That being said I would recommend double checking the torque on the bolts and alignment of everything. The car should still move as the spring rate dictates more movement than anything (apples to apples of course).
 
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