After 14 years since the initial introduction of Lexus LS400 and ES250, most of the suspension bushings are about to wear out. There two opinions in replacing the bushings. The first obvious choice would be OEM replacement. However, some OEM parts does not come with just the bushings, you would have to buy the complete part. Unless your car was in a severe auto accident, most of the time you do not need a completely new suspension parts. Bushings are what wear out through out the years of driving. I have done my own research on the net about Lexus LS400 Bushing replacement and no luck. The only company that currently make bushings for the Lexus is Daizen Sport Tuning (DST).
DST bushings were created with performance in mind. Their bushings increased road feel and handling characteristics. Replaces worn OEM rubber bushings, which are highly susceptible to cracking and deterioration. A sensible (and permanent!) alternative to purchasing $500+ stock replacement control arms! Daizen Sport Tuning high performance polyurethane control arm bushings eliminate unsafe driving conditions and poor handling by allowing minimal deflection of the control arms during dynamic vehicle operation. Unwanted camber, caster and toe change become a thing of the past, with control arms operating only in their designated arc and suspension travel parameters. The potential for irregular tire wear is greatly reduced, which is usually a result of the inability to properly align the suspension to required alignment specifications. The rubber composition of the OE bushings is highly susceptible to wear and deterioration over time - hot/cold cycling, road salt and other extreme road conditions will accelerate this condition. This bushing failure problem can occur in as little as 30,000 miles and almost always by 70-80,000 miles. Some symptoms of this deteriorated bushing problem are: Excessive tire wear; the inability to properly align the vehicle; audible "clunk" noises from floorboard area, especially when turning or backing up; wandering and/or unstable steering especially at higher speeds; unstable braking; vibration at higher speeds. An increase in braking stability is also achieved, due to the fact that the control arms will not shift or oscillate forward and backward under the extreme lateral loads experienced during heavy braking. If other suspension upgrades such as springs, struts or sway bars are installed, the benefits of each will be maximized when used in conjunction with our high performance control arm bushings. Just as with our other polyurethane suspension components, there is no worry of deterioration of the bushings over time with extreme use or with harsh road conditions. The lower durometer hardness of these bushing sets provide a very acceptable ride, as they were specifically designed with Lexus owners in mind. A significant upgrade in handling is provided, with a minimal effect on overall ride quality. These kits are not like typical aftermarket hard durometer bushing kits, which while improving handling, also noticeably degrade a vehicle's ride quality and comfort level.
I got a set of front Daizen Lexus 1990-1994 LS400 from TM Engineering and finally installed the bushings today. After taking the upper control arm (UCA) and lower control arm (LCA) out. I don't remember Daizen's instruction stated flame torch to take out the old bushings. The propane torch is your best friend. One can is more than enough. We tried to use hydraulic press to take out the old bushings but no luck. Those 10-14 years old bushings were build to stay on. Finally I remembered someone told me about using a propane torch.
Lower Control Arms:
Upper Control Arm:
Here is what one of my member say about Daizen Bushings:
Since I have a lot more time than money, I took on the task to install the new bushings and lower ball joints on my 1990 LS400. My car has 165K miles. The old lower ball joints had about an 1/8th inch play in while the upper ball joint had no play. The upper control arm bushings were very warn and loose but I noticed very little play in the lower control arm bushing. I replaced the lower control arm bushing anyway since I am sure the Daizen bushings will last a lifetime as well as offer an improvement over the OEM. The improvement in ride and steering is very noticeable. Clunks are gone. Ride is very smooth. A few things I learned in doing the job myself. Don't try it without a Lexus repair manual. The repair manual is very straight forward and easy to follow. Most of the bolts and nuts haven't been touched since the car was first assembled. I found an 18 inch cheater bar made breaking the bolts loose simple and saved a lot of skinned knuckles. The upper control arm bushings are the easiest to replace as you just need to press the entire bushing out.
lower control arm bushing is more time consuming. As the Daizen
instructions state, you need to heat up the inner aluminum core of the
original bushing until the rubber around it melts enough to press it out.
I only had a propane torch so this took about 15-20 minutes of heating for
it to start melting the rubber. As the Daizen instructions state, you will
reuse this aluminum core. Once I got the aluminum core out, I just let the
rubber in the bushing continue to burn and scraped as much of the rubber
residue off as I could. The outer steel sleeve of the original bushing
must stay in place on the lower control arm. I then cleaned all the left
over rubber off by using my Dremel tool with a sanding wheel attachment.
It took a while but I eventually had a very clean inside to the original
bushing to then install the Daizen bushings on. This took me about an hour
per lower bushing. I am sure others can improve on this by using a hotter
torch. I liberally greased the bushings with the included waterproof
grease which has to be the stickiest grease invented to date. (Don't want
these new bushings to squeak.)