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5 Speed Final Ratio / RPM and MPH

 
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  #1 (permalink)  
Old 06 Sep 2011, 08:31 pm
TurboDucky's Avatar
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Question 5 Speed Final Ratio / RPM and MPH

Hi all,

I'm trying to determine if this is good idea, or not. My '01 / 5 Spd has problem with 3rd gear, the Synchro is pretty well wiped. I've done some checking and found out that the newer model ('03 and up, I think) have a higher 5th gear ratio. I've found a good deal on a boneyard tranny from an '05. What I'm trying to determine is - What is your RPM @ 70 MPH on a later model PT? I'm currently turning about 3300 RPM @ 70MPH with mine, and I'd to see that lower at that speed. But, I don't want it "over geared" either... Can someone help me out here?
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Old 06 Sep 2011, 10:07 pm
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Default Re: 5 Speed Final Ratio / RPM and MPH

there's a calculator on neons.org

I think the 2.4 will pull the large vehicle 3.94 w/ .72 top gear;
my 2.0 DOHC Neon won't pull .72 w/ a 3.55 final drive and tall snows-
Spent lots of time in fourth.

If you really want to experiment try the 3.55

Happen to have one ...
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Old 07 Sep 2011, 10:36 am
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Default Re: 5 Speed Final Ratio / RPM and MPH

Quote:
Originally Posted by UptownSport View Post
there's a calculator on neons.org

I think the 2.4 will pull the large vehicle 3.94 w/ .72 top gear;
my 2.0 DOHC Neon won't pull .72 w/ a 3.55 final drive and tall snows-
Spent lots of time in fourth.

If you really want to experiment try the 3.55

Happen to have one ...
What does the .72 mean??

The newer ones are 3:55 - That's what I'm curious about.

You have one? How much $$, and where are you?

-Gary-
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Old 07 Sep 2011, 06:15 pm
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Default Re: 5 Speed Final Ratio / RPM and MPH

There are two (essentially) different ratios since production started in 1993-
3.55 and 3.94.

ALL T-350's are interchangeable, hydraulic bellhousings started in '01.
You can swap the bellhousing's back and forth; you should check differential
rolling torque (preload) if you do this.

Steel quality increased in ~ '01, but older T-350's would handle IMMENSE
torque, so don't worry about this.

There were nominal changes in 2d gear ratio with the newer trans, 2d
was slightly steeper.

there's two 5th gear ratio's, .81 (aka the 'ACR' ratio) and .72

These transmissions are CHEAP, and I mean CHEAP. $75-$250
They are EZ to work on, and reliable.
Differential, per se, needs two 'differential saver tabs' (Newer models
have these installed) and are ~ $3 each. Shift fork will sometimes wear,
but don't they all ...

And of course, boogers.

Here's a simple primer from our Neon factory rep genius (knows more than God!);
Greg:

http://www.neons.org/forumdodge/trans.htm

Right now I have a t-350 hydraulic bellhousing (4668697AC), it'll have differential saver tabs installed.
It has the .81 final drive, so OTG is STEEP. It'll likely go closer to top range.

I'm in Minneapolis.
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Old 07 Sep 2011, 06:19 pm
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Default Re: 5 Speed Final Ratio / RPM and MPH

Question - how do you know it's a T350 and not a G288? Just curious. Also, I'll do a test run and tell you what my '06 GT turns at, at 70mph. However, being a GT, it's got the G288 tranny which is different in many ways from the T350.
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Old 07 Sep 2011, 06:23 pm
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Default Re: 5 Speed Final Ratio / RPM and MPH

And usually the shift fork wears, the 3-4 fork is Way less than $100,
servicing it is simple, I have a how-to I'm working on, I put in part that
you wouldn't need to do so far:

Minnesota's Community of Neons! • View topic - Manual Transmissions (In Progress)
Quote:
4796650 $78.75
FORK TRANSMISSION
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Old 07 Sep 2011, 06:28 pm
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Default Re: 5 Speed Final Ratio / RPM and MPH

Quote:
Originally Posted by Chromenut View Post
Question - how do you know it's a T350 and not a G288? Just curious. Also, I'll do a test run and tell you what my '06 GT turns at, at 70mph. However, being a GT, it's got the G288 tranny which is different in many ways from the T350.
You already said it, sir- T-350 is NA, and Getrag / T-850 is tubo.

I know NOTHING of the turbo or RWD tannys-

There's a tag on driver's end of trans etched "NVT-350"
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Old 07 Sep 2011, 06:57 pm
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Default Re: 5 Speed Final Ratio / RPM and MPH

Oh, I figured from his handle that he had a turbo PT...doh....
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Old 07 Sep 2011, 07:39 pm
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Default Re: 5 Speed Final Ratio / RPM and MPH

Quote:
Originally Posted by Chromenut View Post
Oh, I figured from his handle that he had a turbo PT...doh....
Oops, sorry. I should have mentioned that. It's a NA Cruiser. The Turbo thing is just wishful thinking for now, until I get time to get my Rampage put back together. I've got a complete Shelby drivetrain to put in it..

My Brother in law has an SRT4, and he's running about 2500 RPM at 70. I do know that Chrysler has a tendency to over gear some vehicles. I'm guessing it's a fuel mileage thing, but driveability suffers sometimes. I'm in central Ohio, and we have pretty much all types of terrain.

I'd be really upset if I changed to the newer trans, and then hated it because of the gear ratios.....
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Old 07 Sep 2011, 11:39 pm
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Default Re: 5 Speed Final Ratio / RPM and MPH

Put some REALLY tall scrub tires on front to 'test' how you'd like the 3.55 ratio

Here's a tire calc so you determine size:

Neons.org Tire Calculator
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