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SC300 Vibrating heavily!

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Old 05-14-14, 11:37 PM   #1
MORPM
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Unhappy SC300 Vibrating heavily!

Hello Lexus komrades, I currently own a 92' SC300, recently it started vibrating heavily when I would hit about 45mph+ and when letting off the pedal then going below 45 it drives normal no vibration... Yes I got the tires new, balanced and rotated them ✔ Some mechanics were also saying it was a driveshaft issue so I switched it out from another salvaged SC300 ✔ and I replaced the coupler flex on it as well (new) ✔ and finally I got a very good condition Rear subframe from a 98' and installed it and well it still vibrate but not as bad before... Any help I'd appreciate ! If Mods can put this in the correct category please I'm a Newbie to the forum.
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Old 05-15-14, 12:34 AM   #2
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Engine mount or tranny mount?
I hope this isint the first time you've posted here about this problem. Seems like with all the combined knowledge here on CL it would have been fixed a long time ago rather than going through all the expensive fixes you've tried.
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Old 05-15-14, 10:17 AM   #3
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Your tyranny is going. Hard to find good mechanics these days. Look at it this way....you have a car with age, no longer in production. Prepare to replace EVERYTHING. Sometimes it's costly but so is maintenance on a new car. Replace the tyranny n and you should be ok.

Last edited by pur4orm; 05-15-14 at 10:19 AM. Reason: misspelled word
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Old 05-15-14, 11:54 AM   #4
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I sense a 5 speed swap in your future.
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Old 05-15-14, 04:49 PM   #5
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It's NOT a tranny issue.
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Old 05-15-14, 08:56 PM   #6
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just do a 2jzgte swap next, see if that helps lol
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Old 05-15-14, 10:42 PM   #7
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Mine did this as well, it suddenly stopped so I never got around to seeing the cause.
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Old 05-15-14, 11:29 PM   #8
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My 97 sc400 did this as well. It turned out to be both of the rubber engine mounts had ripped in half. Although, I also had my 93 sc300 to have a similar problem back in the day. The front driveshaft had somehow got unbalanced and caused vibrations at certain speeds, but if you have replaced yours with one that you know for a fact to be good then you shouldnt have any problem there.
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Old 05-16-14, 02:08 AM   #9
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Quote:
Originally Posted by pur4orm View Post
Your tyranny is going. Hard to find good mechanics these days. Look at it this way....you have a car with age, no longer in production. Prepare to replace EVERYTHING. Sometimes it's costly but so is maintenance on a new car. Replace the tyranny n and you should be ok.
I highly doubt it's tranny.. I've already been thru that as well lol usually I can feel the gears slippin' even if
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Old 05-16-14, 02:13 AM   #10
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Quote:
Originally Posted by Sylexus View Post
Mine did this as well, it suddenly stopped so I never got around to seeing the cause.
It's like a very "fixed" vibration.. I feel like its with the bushings and mounts somewhere...
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Old 05-16-14, 02:18 AM   #11
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Quote:
Originally Posted by perkins92 View Post
My 97 sc400 did this as well. It turned out to be both of the rubber engine mounts had ripped in half. Although, I also had my 93 sc300 to have a similar problem back in the day. The front driveshaft had somehow got unbalanced and caused vibrations at certain speeds, but if you have replaced yours with one that you know for a fact to be good then you shouldnt have any problem there.
Exactly! Even the coupler flex. I remember doing an engine mount replacement as well 1 1/2year ago, Il check those again maybe the heat is eating away at the rubber.
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Old 05-16-14, 02:24 AM   #12
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Quote:
Originally Posted by mikef View Post
just do a 2jzgte swap next, see if that helps lol
Any spare parts bud lol
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Old 05-16-14, 03:16 AM   #13
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Quote:
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Exactly! Even the coupler flex. I remember doing an engine mount replacement as well 1 1/2year ago, Il check those again maybe the heat is eating away at the rubber.
Did you do both mounts? Did you also do the transmission mount?
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Old 05-20-14, 10:25 PM   #14
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Alrighty so it seems that there's an issue with the differential bushings.. What's your advice guys should I go ahead and sell it or is there another possibility? I've already went thru 3 things to try knocking out the issue... it's like having a crazy psychotic gf lol
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Old 05-20-14, 11:36 PM   #15
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Diff bushings arent very expensive. Why make that cause you sell it?
I still think its you're tranny mount. When I replaced mine it got rid of a lot of vibrations, some of which were very similar symptoms to yours.
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