LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

Slammed UCF10 Owners! I need your help with rear UCA's

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Old 10-27-16, 01:16 PM
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slmdlex
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Default Slammed UCF10 Owners! I need your help with rear UCA's

Does anyone have an issue with the rear upper control arms hitting their coilovers? Mine are extremely close, I had to raise my coils almost to their max height. I'm running BC Racing extreme low coilovers with 34kg/32kg Swift springs(Stupid stiff) Apparently no one makes rear upper arms for the UCF10, and I don't know what to do fix this issue.

Here's the car and coilovers. I don't have pictures of how close the arm is because the starter is getting replaced and I haven't had my car for 2 months




Old 10-27-16, 01:51 PM
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timmy0tool
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are you actually getting rubbing sounds and marks on the coilovers from being too low? I ask bc i'm on air running BCs (albeit on my 97) and they are indeed close but they barely make a scratch when fully slammed or aired out.

I have not heard anyone clearancing their rear upper a-arms before. the UCF10 models should be very similar in design from UCF20s.
Old 10-27-16, 02:04 PM
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slmdlex
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Originally Posted by timmy0tool
are you actually getting rubbing sounds and marks on the coilovers from being too low? I ask bc i'm on air running BCs (albeit on my 97) and they are indeed close but they barely make a scratch when fully slammed or aired out.

I have not heard anyone clearancing their rear upper a-arms before. the UCF10 models should be very similar in design from UCF20s.
I drove the car on the coilovers for 2 days before the starter went out, so I haven't looked at them after driving but I didn't hear anything hit. Where my car sits now the upper arm is about a 1/4" from the coilover. The way they came from BC was too low, I couldn't even bolt them in at that height because of the upper arm hitting. I had to raise the coil up almost 2" for it bolt up.
Old 10-28-16, 05:43 PM
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PureDrifter
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The rears pretty much don't hit unless you jump it or you're on air.

The Fronts are very different.
Old 10-31-16, 10:57 AM
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Suprjdmbro
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Originally Posted by slmdlex
I drove the car on the coilovers for 2 days before the starter went out, so I haven't looked at them after driving but I didn't hear anything hit. Where my car sits now the upper arm is about a 1/4" from the coilover. The way they came from BC was too low, I couldn't even bolt them in at that height because of the upper arm hitting. I had to raise the coil up almost 2" for it bolt up.
My coilovers are munched from all the rear camber thanks to the lower control arms, and of course the low. I started by enlarging the hole for the coilover in the UCA, now I have aftermarket UCAS. Just make the hole bigger, unless you do not plan on adding much negative camber, then you won't have any issues.
Old 11-01-16, 12:22 PM
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timmy0tool
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the coilovers are not meant to be installed right out of the box. they are set to the shortest setting so they fit in the smallest box possible for packing purposes only. you will always need to dial in the height (i.e. lengthen) during installation as I see you already did. sounds like you can do some clearancing as suprjdmbro stated.
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