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 > 4 speed vs. 5 speed automatic???

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pmfinnegan2

S.E. Michigan

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Posted: 03/27/08 06:17pm Link  |  Quote  |  Print  |  Notify Moderator

Hello,

I am asking this for a friend of mine. I have a friend of mine who is getting ready to purchase a new vehicle. While making this purchase he wants to make sure he gets a vehicle that can tow a smaller (18-23') TT or HTT. To meet his family needs and wants, along with his budget he has chosen to go with a Dodge Durango. When making this purchase he is going to get the 5.7L V-8 with the factory tow package.

A question he had for me today that I wasn't completely sure of is; Should he get the 4 speed automatic transmission or the 5 speed automatic transmission? Why???

Thanks

* This post was edited 03/28/08 06:56am by pmfinnegan2 *


pmfinnegan2
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8.1 Van

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Posted: 03/27/08 06:23pm Link  |  Quote  |  Print  |  Notify Moderator

The 5-speed because it should have a lower 1st gear for towing and a better OD 5th ratio for fuel economy when not towing.


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Exocet

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Posted: 03/27/08 06:26pm Link  |  Quote  |  Print  |  Notify Moderator

I thought the 5.7L only came with a 5 speed (545RFE)? That transmission has two overdrives, with 3rd gear being 1:1.


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SemperFiCop

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Posted: 03/27/08 06:27pm Link  |  Quote  |  Print  |  Notify Moderator

Generally, a five or six speed trans with overdrive (lower RPM's) should get better gas mileage...





wsb711usa

northern Illinois

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Posted: 03/27/08 06:28pm Link  |  Quote  |  Print  |  Notify Moderator

pmfinnegan2 wrote:

When making this purchase he is going to get the 5.7L V-8 with the factory tow package.


According to dodge web site a 5 speed is only with the 5.7!!!!!


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SemperFiCop

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Posted: 03/27/08 06:48pm Link  |  Quote  |  Print  |  Notify Moderator

wsb711usa wrote:

pmfinnegan2 wrote:

When making this purchase he is going to get the 5.7L V-8 with the factory tow package.


According to dodge web site a 5 speed is only with the 5.7!!!!!


with choice of 3.55 or 3.92 rear axle

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Posted: 03/27/08 06:56pm Link  |  Quote  |  Print  |  Notify Moderator

The 545 is actually a six-speed, although they don't advertise it as such. Skips a gear in the upshift sequence.

http://en.wikipedia.org/wiki/Chrysler_45RFE_transmission


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retired1

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Posted: 03/27/08 08:40pm Link  |  Quote  |  Print  |  Notify Moderator

Exocet has it right.


Retired1


fla-gypsy

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Posted: 03/28/08 03:32am Link  |  Quote  |  Print  |  Notify Moderator

They will be happier towing with the 5 sp and 3.92 rear.


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KC8WX

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Posted: 03/28/08 04:56am Link  |  Quote  |  Print  |  Notify Moderator

545RFE and a 3.92.

3.55 is Weak for towing. I converted this year to a 4.10.


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