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

UCF20 Rear Upper Control Arms install question

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Old 05-14-16, 12:16 PM
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Kaiyin
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Default UCF20 Rear Upper Control Arms install question

Has anyone done the rear upper control arms on a ucf20 before? How did you get the nut that holds the ball joint off? I've got mine mostly torn apart and can't get that nut off. Seems like the axle needs to come out?

No, I'm not replacing my RUCA because they went bad. I finally got SerialNine RUCA

Any tips would be appreciated. I'd like to get this done myself before I have to bring it to a friend's shop. I'm out of ideas!
Old 05-14-16, 04:05 PM
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valex
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You have to remove the Rear upper control arm attached to knuckle and then disconnect the ball joint from knuckle when it's off the car. The nut is not reusable per service manual.
Old 05-14-16, 09:28 PM
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valex
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on 1998-2000 it is this parts number, not sure about earlier years.
Attached Thumbnails UCF20 Rear Upper Control Arms install question-nut123.jpg  
Old 05-15-16, 08:09 AM
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Originally Posted by valex
on 1998-2000 it is this parts number, not sure about earlier years.
I forgot to mention that new rear UCA come with those new nuts!
Old 05-15-16, 09:32 PM
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Shmee
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Pretty sure you either need a special tool or you have to pull the driveshaft out of the knuckle, which means you have to disconnect the lower arms from the knuckle to get the driveshaft out. Once it's out, you can easy get at the nut on the RUBJ and then knock it out with a long punch/drift once the nut is off.
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