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GS430 Better Tranny shifts just by adjusting dial?

 
Old 02-14-12, 02:28 PM
  #91  
sam12345
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I understand this will make full throttle shifts quicker and crisper. My question is what does it do to light throttle shifts? Are light throttle shifts smooth as butter like before?
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Old 02-14-12, 02:45 PM
  #92  
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Originally Posted by sam12345 View Post
I understand this will make full throttle shifts quicker and crisper. My question is what does it do to light throttle shifts? Are light throttle shifts smooth as butter like before?
Nope. It will shift harder than before.
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Old 02-14-12, 03:49 PM
  #93  
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This sounds similar to a valve body upgrade. Faster, snappier shifts at WOT but perhaps harsh at part throttle, relaxed driving. I think this would **** me off.
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Old 02-14-12, 05:57 PM
  #94  
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When I did mine I had to unbolt the dipstick tube because it did not want to seperate at all. Also, after a few months of driving after doing the mod the part throttle shifts aka normal driving is not harsh at all. It feels normal or maybe a little quicker, but nothing like a built auto with a valve body upgrade. WOT shifts do feel quicker. For comparison my brother had a pontiac firebird with a built auto and a valve body upgrade and the car would chirp in every gear, this is nowhere close.
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Old 02-14-12, 06:11 PM
  #95  
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Anybody try the second position to see if it is a good compromise between smooth shifts at low throttle and crisp shifts at wot?
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Old 02-14-12, 11:27 PM
  #96  
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Thanks for the help, Sam430 & 850Lexus. I'll try the chisel/putty knife method. Hope it'll work. Car is garaged atm, so I'll have plenty of time to work on it.

I don't expect any major changes in shifting with this mod. It's just a different setting. But faster shifts at WOT are most welcome.
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Old 02-15-12, 08:03 AM
  #97  
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I have never hit WOT in this car. It is my DD so normal driving is great, no hard shifting.It is still Lexus smooth, it just has a little more of a crisp feel. It is a little quicker, barely noticeable. I put about 1,000 miles on my GS in a week and I have lost zero drive ability doing this.
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Old 02-15-12, 08:17 AM
  #98  
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Thanks for the feedback ! Just what I wanted to hear.
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Old 03-18-12, 01:42 PM
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Okay, finally got the pan off. Thanks for the tips, you really helped me out.

So the tranny was already set on position 2 (middle). I set it to one (one click to the right).

Some pics:

Default setting:


New setting:

Last edited by YviE; 03-19-12 at 02:21 AM.
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Old 03-21-12, 05:52 AM
  #100  
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nice write up, any difference!?!
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Old 04-16-12, 02:46 PM
  #101  
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Well, haven't been able to try yet. Car will be up and running in a month or two. So I'll keep you updated.
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Old 04-16-12, 03:02 PM
  #102  
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Originally Posted by RMMGS4 View Post
Just caught this thread and I just so happened to be changing out my tranny filter today. Note that I already have the valve body mod (originally offered by Rod Millen Motorsport) on my car since I bought it. When I dropped the pan to look for this dial, low and behold the adjustment had already been made ! ! !

So apparently RMM has known about this adjustment and I suspect it was part of the process when the new valve body was installed.

You can take my assumptions for what it's worth but the REAL point here is that I have been running with this modification for over TEN YEARS of which my car has been supercharged for 5+ of those years.

It goes without saying that I have driven my car hard on occasion and I can tell you the tranny has functioned without any reliability issues thoughout these 10+ years. Also note that I have a hi stall TC and I'm running AMSoil synthetic.

Based on my findings, I'd say this mod is good to go.



.
As soon as i clean out the garage and find a local amsoil dealer i'm doing this mod!!!
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Old 05-15-12, 09:29 AM
  #103  
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My transmission blew after i did this adjustment. It drove fine for the first couple of days. Then i noticed the rpms were slightly different. When coasting the car rpms would drop significantly. I checked the fluid level many times and it was always cherry red and upto hot with 10-15mins of driving. It blew coming home one day in rush hour traffic. Car accelerated really slow and would leap violently forward this went on for a couple of minutes until i found somewhere safe to pull over. Had to get it towed because it would no longer move in gear. I got a use tranny with 130000km(80000miles). Got it installed and car was back to the way it was. This time i opted out of touching that dial. Btw my car has 250000k(150000miles). Just thought id share.



Heres a picture of the tranny i took out.
[IMG]file:///C:/Users/user1/Desktop/DSC00002.JPG[/IMG]
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Old 05-15-12, 10:39 AM
  #104  
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for pics oyu need to upload it online or upload it via the forum.
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Old 05-16-12, 01:34 AM
  #105  
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mtofique, I think your tranny already had a problem of some sort prior to changing the setting.

Apparently Lexus adjusts the setting on the tranny for some countries. Mine (Euro GS), for instance, was set on position 2 from factory, whereas the US GS seem to come set on position 3 from factory.

I have a hard time believing that changing the setting could harm a perfectly healthy transmission. This is really not a modification, rather a simple adjustment.
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