Front Upper Control Arm Questions
11-07-13, 09:29 AM
#1
Not to happy with my driving experience.
I recently replaced my lower control arms with supra one's. Also replace the rack with new tie rods. Motor and tranny mounts. Four brand new tires. Also put supra shocks/springs with new mounts on the front. 97 SC400, 125k miles, with 18x8 wheels.
The problem is the car is very harsh over bumps and after 3k miles has developed a "tremor" again. The front end also feels loose going over potholes and such. Alignment is good, wheels have been rebalanced again. Yesterday I put yet another new tranny mount on since the other one looks squished again. It only had 6k miles on it ( I replaced it a few months prior to everything else) . Didn't seem to help the car much and actually feels more clunky in the driveline.
The only thing I have not replaced are the front upper control arms. I will probably replace those now but if that don't fix the tremor and harshness, what else should I be looking for??
Thnx
The problem is the car is very harsh over bumps and after 3k miles has developed a "tremor" again. The front end also feels loose going over potholes and such. Alignment is good, wheels have been rebalanced again. Yesterday I put yet another new tranny mount on since the other one looks squished again. It only had 6k miles on it ( I replaced it a few months prior to everything else) . Didn't seem to help the car much and actually feels more clunky in the driveline.
The only thing I have not replaced are the front upper control arms. I will probably replace those now but if that don't fix the tremor and harshness, what else should I be looking for??
Thnx
Last edited by gtsfire; 11-12-13 at 08:30 PM.
11-13-13, 03:55 PM
#4
I took a tire off today and used a small screwdriver to pry on the UCA and it seems to move pretty easily back and forth on the bushings with little effort. I'll buy a couple and hopefully it shouldn't be to hard to replace them. I think breaking the ball joint will be the hardest part. I do have a set of new prothane bushings laying around for the uca's but I do not feel like messing with pressing them in and out.
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11-13-13, 11:51 PM
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i've fallowed your build and repairs. imo you should go poly. same thing with tranny mount that oem rubber is just going to wear out over time but don't have too much option there. i know your arms and stuff are new but poly is better than oem anyday. you shouldnt be having any problems already with everything you've replaced and your buddy seems to know what he's doing and has a nice shop. the uca bolt tends to bend and wiggle a bit. my drivers side did. could be something weird like that.
11-14-13, 07:58 AM
#10
in addition to your suspension; you may want to see what rate tires you have. some will produce more noise than others and distribute vibration through the suspension as well. perfect example; on my jeep i have 235/45/18 blizzaks and a set 0f 235/45/18 michelin pilot sport. the pilots are way noisy and it takes bumps and holes violently! my blizzys are a ton more quiet! check those tires
11-14-13, 11:09 AM
#11
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11-14-13, 02:53 PM
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yea center bearing can do it too, my a70 supra used to do this, it ended up being the diff, there is a pressure release valve on the top that is spring loaded but somehow it stopped working, i used redline lsd oil in it but it was just bad and overheated. i got a diff from a parts car and it stopped clunking per revolution of the tire, happened even worse at low speeds or coming to a stop.
Last edited by SCstone; 11-14-13 at 02:56 PM.
