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K-member troubles

  • Thread starter Thread starter Shotgun76
  • Start date Start date Apr 26, 2019
S

Shotgun76

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Apr 24, 2019
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Apr 26, 2019
#1
  • Apr 26, 2019
  • #1
I just bought a ‘91GT that has a UPR Tubular K member and Control Arms. Previous owners said he just bolted it on and never adjusted or set everything up. Looks like he did t know what he was doing. Car also ha Camber Plates. I’m running 17” Cobra R wheels and the front wheels seem to stick out pretty bad. Steering shaft hits the left header, car rides like with Lakewood Drag struts. I’m thinking pull all this crap off and go back to stock I definitely have to get this fixed, car is barely drivable.
 

General karthief

wonder how much it would cost to ship you a pair
5 Year Member
Aug 25, 2016
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Apr 26, 2019
#2
  • Apr 26, 2019
  • #2
I would call upr and see what their recommendations would be for the type of driving your going to do with the car.
Then get the thing aligned.
 

CarMichael Angelo

my rearend will smell so minty fresh,
15 Year Member
Nov 29, 1999
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Birmingham, al
Apr 27, 2019
#3
  • Apr 27, 2019
  • #3
Shotgun76 said:
I just bought a ‘91GT that has a UPR Tubular K member and Control Arms. Previous owners said he just bolted it on and never adjusted or set everything up. Looks like he did t know what he was doing. Car also ha Camber Plates. I’m running 17” Cobra R wheels and the front wheels seem to stick out pretty bad. Steering shaft hits the left header, car rides like with Lakewood Drag struts. I’m thinking pull all this crap off and go back to stock I definitely have to get this fixed, car is barely drivable.
Click to expand...
The strut is probably a 90/10 compression/extension ratio if it's a typical drag strut. It'll extend like a dead strut, and it'll take a Herculoid to compress it. That is probably one of the worst contributors to the ride issue.
Depending on what brakes are on this car, (stock, 4/5 lug) the last time I saw a drag mustang with its tires sticking too far out, came as a result of using an Aerospace aftermarket brake system. Their 4 piston caliper forces the rotor hat to sit too far out, and the resulting wheel mating surface ended up way the hell out there. They do have a 2 piston kit that remedies that.
The other 5 lug possibility causing this issue is if the original owner used a 96 or later mustang spindle/rotor combo..that too would cause the tires to hang out, all maloccluded lookin' an sht.

But, if it don't have aftermarket, or 5 lug later model brakes on this car, I got nothing for ya other than a wrong part#. In the K member system altogether.

As to the steering shaft hitting the header...that could be related to the set back on the engine..some k members IIRC allowed for an extra inch or so setback when mounting the engine, so that the weight could be managed a little better, or the k member is simply cocked at an angle, because as you said...the original owner just bolted it in with out bothering to set it up.

If you're not drag racing the car, id ditch the lightweight junk in favor of the stock stuff anyway. The added structural integrity of the heavier stock k member will translate into a less harsh ride, especially if you are using a 17x9 wheel/tire upfront.

This is one of the things that will quickly take a tolerable riding everyday driver, and make it into a teeth jarring, nervous driving version instead. The cars need a little bit of weight to make them more civil, as opposed to going on the " race weight" diet some guys subject them to to keep them planted on the corners, and that UPR front end is a perfect example of a drag part that should never end up on a street car.

My last Notch rode better having a heavier 4.6 SOHC installed as opposed to the 4 cylinder that was there before purely because the engine made the car heavier. The coil overs on all four corners made it even better.
 
Last edited: Apr 27, 2019

2000xp8

SN Certified Technician
Aug 8, 2003
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Apr 27, 2019
#4
  • Apr 27, 2019
  • #4
First i'd see if you can find a part/model number and see exactly what you have.
Toss the drag struts, they are awful on anything other than a race car.
Is there a sway bar on the car?
As mike asked, Brakes?
Did you try squaring up the k member?
What kind of headers?

For k members, I like either high end or nothing.
 
Reactions: General karthief

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
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Apr 27, 2019
#5
  • Apr 27, 2019
  • #5
Sometimes there's nothing like a stockish car after enduring a car with the wrong combo of aftermarket parts thrown at it.

Sounds like someone set the car up for purely straight line racing and it doesn't translate well to cruising comfort.

I'd first start to ID the parts you have before changing things out. On the positive side, a stock k member and some other parts will be cheap to acquire.
 
S

Shotgun76

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Pikeville. KY
Apr 27, 2019
#6
  • Apr 27, 2019
  • #6
I have not checked part numbers on the k-member, need to though. Stock 4 lug setup all around. He gave me some slotted and drilled rotors, calipers and 94-95 spindles. Headers are BBK.
Thanks for the replies!
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
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Apr 27, 2019
#7
  • Apr 27, 2019
  • #7
If it so stock 4-lug then the cobra R might be the wrong offset
 
S

Shotgun76

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Apr 24, 2019
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Pikeville. KY
Apr 27, 2019
#8
  • Apr 27, 2019
  • #8
Mustang5L5 said:
If it so stock 4-lug then the cobra R might be the wrong offset
Click to expand...
That’s what I originally thought, like he might have 4 rear wheels on it. I believe they’re 17x9. 235 up front 245 in the back
 
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