creek,
I own a '92 SC400 with 174k miles. Last month, I had the left and right front lower control arm bushings replaced.
The labor cost was $320 (4 hours @ $80 per hour) at an independent mechanic who frequently works on Lexus. Each front lower control arm has a front and rear bushing.
The cost of the four bushings from the Lexus dealer was about $150.
Although the front LCA bushings are not listed for 92-96 model years, the bushings for 97-00 will work just fine. The part numbers are:
Front LCA front bushing - 48654-24040
Front LCA rear bushing - 48655-24050
The car now rides much, much better. No more suspension bonking on bumps.
Front LCA bushings are also available from Daizen (TM Engineering). http://www.tmengineering.net/suspension/daizen/index.html
LCA bushings also available from Vlamos. http://vftbushes.com
A lot of SC owners like the Daizen bushings, which give a stiffer ride than stock. I wanted the cushy stock ride and so I didn't get them. The Vlamos are said to ride like stock, but they're a lot more expensive.
My local Lexus stealer wanted $1,600 for parts and labor to replace the two front lower control arms. Simply replacing the bushings was not an option with the dealer.
Here's a thread on ClubLexus where I learned about the SC400 '97-00 model year bushings also working for 92-96 models. http://www.clublexus.com/forums/showthread...ght=48654-24040
Here's a more recent thread in which someone else also did this replacement and liked the results. http://us.lexusownersclub.com/forums/index...topic=17211&hl=
Good luck!
Alfonso