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Old 23 Jan 2013, 11:42 pm
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Default Automatic transmission ratios

Just wondering if any of you think that the overdrive ratio should have been higher (or should i say lower for less rpm's) for turbo gt 220 hp?

My 2005 turns 2900 @ 78 mph indicated. It seems that it has plenty of power at that rpm.

What do you think, and what have others done if anything ?
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Old 23 Jan 2013, 11:57 pm
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Default Re: Automatic transmission ratios

Quote:
Originally Posted by Chriscokid View Post
Just wondering if any of you think that the overdrive ratio should have been higher (or should i say lower for less rpm's) for turbo gt 220 hp?

My 2005 turns 2900 @ 78 mph indicated. It seems that it has plenty of power at that rpm.

What do you think, and what have others done if anything ?
Not sure exactly what your question is or where this thread is going? Sorry?
It is a good engine speed to power. At sea-level cruise speed of 78mph in OD no boost you might be using 90whp of the claimed 220whp ?
Aside from changing to different height tires there is nothing else you can do. There are no companies offering ring and pinion gear options that I now of for the PT transmissions? There is a company I know that can make any gear ration you want but they are in the UK and the sets start at $2000.
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Old 24 Jan 2013, 01:00 am
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Default Re: Automatic transmission ratios

If you are looking to get up to speed quicker just use the autostick. Let it shift itself. You can do over 100 mph in 3rd very easy (just ask the guy in the Honda who try to beat me over the bridge this morning)
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Old 24 Jan 2013, 03:08 am
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Default Re: Automatic transmission ratios

I'm not sure, but I believe all the transfer sets interchange, back to the 70's or early 80's.
This is how Chrysler changed overall ratio's.

You can also swap to a manual. I'm sure it's like, that EZ
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Old 24 Jan 2013, 09:25 am
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Default Re: Automatic transmission ratios

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Originally Posted by UptownSport View Post
I'm not sure, but I believe all the transfer sets interchange, back to the 70's or early 80's.
This is how Chrysler changed overall ratio's.

You can also swap to a manual. I'm sure it's like, that EZ
If you are talking about the ring and pinon with the auto boxes that would be interesting to find out. I don't think they do? That would be a cheap mod though wouldn't it?
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Old 25 Jan 2013, 02:41 am
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Default Re: Automatic transmission ratios

No, transfer gears:

www.neons.org Transfer Gears and RPMs
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Old 25 Jan 2013, 09:00 am
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Default Re: Automatic transmission ratios

Thanks for the input. I'm really happy with the way it runs already, it just seems that if the overdrive lowered rpms a little more it would get better mileage. The engineers probably picked a happy medium so that it doesn't downshift much for normal driving.
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Old 25 Jan 2013, 10:51 am
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Default Re: Automatic transmission ratios

Also the higher the gear the more stress on the clutch pack and overall transmission.
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Old 25 Jan 2013, 11:34 am
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Default Re: Automatic transmission ratios

The OP's question was just about the overdrive gear and not about the over all gear ratio.

In these days of having to meet (in the US) higher and higher CAFE requirements, I would guess that if the Chrysler engeneers could have simply raised the overdrive ratio practically and safely they would have done it. One of the problem weak links with the trans now is that the overdrive hub is prone to fail because it can't handle the torque the engine can produce with a bit of spirited driving. There's also an issue with the spacing of all the gears. You want the gears to change up and down at a progressive pace and not over rev like a trashing machine if the trans has to downshift to pass, for example.
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Old 25 Jan 2013, 10:11 pm
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Default Re: Automatic transmission ratios

Effective overdrive ratio and overall top gear ratio are inseparable.

I agree factory though before they specified gear ratio!

Seriously, IDK if there's different ratio's for fourth gear or not-
I can say Allpar, Factory Service Manual and Factory Parts Manual are great places to do research.
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