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Here is a great solution for your UCF10 rear upper control arm ball joint. This is not my work, I am copy&pasting this from a Facebook LS400 Drifting Group. Credits to original user who did this and posted it is Jake Burton.
"Here is a solution for the rear upper ball joints. Lexus will only sell the complete arm as an assembly, meaning when the upper ball joints go bad, the arms are trashed.
However, you can use 2005-2015 Toyota Tacoma 4x4 front upper ball joints to replace them.
The only mod required to the arm is grinding /filing down the cup that the ball joint gets pressed in to, by approximately .030" to .060" (/1millimeter)
This can be accomplished with a flap disk on a grinder or a file.
This has to be done for the snap ring to clip into its groove (the flange where the Tacoma ball joint sits on the top side of the arm is slightly taller, not allowing for full protrusion of the snap ring groove)
The ball joints share the same taper and overall length as the OEM. It's also greasable.
I Can confirm this info is correct. I have installed Moog problem solver k80811 ball joints in the rear control arms on my '94.
The ball joints on my arms were completely shot and causing play/clicking at 12 o'clock when rear wheels were in the air. The original bushings were destroyed also which I replaced with Poly.
Great fix since more parts are becoming unobtanium on the UCF10.
07-26-21, 04:22 PM
