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4.10:1 Gears Installed in My Automatic GT!

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Old 03-20-2009, 11:48 AM
  #31  
SC55509
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Good job on the 4.10's, I'll be doing some gear swapping soon myself, but probably going with the 3.73's
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Old 03-20-2009, 12:31 PM
  #32  
grampa_stang
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Here's a quote from Doug (Bama):

Hey guys,

As I'm sure you know if you have my automatic tunes my shifting is entirely different then that of the stock tunes or even the SCT or Diablosport base files. The shift points are set mainly by MPH instead of RPM, except at WOT.

Now when you update your gear ratio this changes everything for the shifting as the MPH points remain the same but the engine RPM at that MPH point is different. So now your transmission shifts faster, depending on the new gear ratio how much faster.

When you update your tunes using the user options on both SCT and Diablosport products it is simply changing the Speedometer settings and correcting this part of the equation. This works fine on the stock tune or even most SCT base files but not on my tunes.

For example say you went to 3.73 gears from the stock 3.31's, at 55mph you used to be doing around 2300 rpm's but now with 3.73's your doing nearly 2600 rpm's. So now you can see why changes need to be made. Also with the converter lock up rates, there again using my tunes.

Feel free to check with your own tuner for required changes using someone elses tunes.

So, if you have gearing changes and you have my tunes that I've not adjusted for and you are feeling faster shift points or the that the transmission isn't shifting properly then just let me know and I'll take care of it for you. This is all covered under my free tune updates for minor bolt ons for the ownership period of your car.

Thanks, Doug.
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Old 03-20-2009, 01:46 PM
  #33  
07BLACKGT
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That's interesting/weird.

I just went to adjust options and scrolled over to axle ratio and selected 4.10... seems to work fine for me. I did this with my Bamachips 87 tune.
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Old 03-20-2009, 03:18 PM
  #34  
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I would assume it is almost the same as dropping it out of overdrive when at high speeds. So if you want to get a rough idea how much different it would be on an auto, get up to speed and take OD off.

Originally Posted by Riptide View Post
I've got 3.55 right now and cruise a lot around town at 40-45mph in 4th gear. I'm guessing with 4.10 I will probably do the same thing. The car will just run a few hundred rpm higher. No big deal. If anything it'll sound better that way.

Waiting for Mishri to get his done. I want to see if there is any gear whine. If it's not bad then I might consider getting mine done by the same shop.
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Old 03-20-2009, 04:34 PM
  #35  
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Originally Posted by 07BLACKGT View Post
That's interesting/weird.

I just went to adjust options and scrolled over to axle ratio and selected 4.10... seems to work fine for me. I did this with my Bamachips 87 tune.
Talk to the MAN...his updated tunes are free.
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