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Danpd66
Dodge Dakota
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3/04/2008
13:00:03

Subject: 4.7 Auto Trans
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What trans is behind the 4.7 in the 2001 Dakota? Is it the 4spd or the 5spd automatic?

Thanks,
Dan



TexasTodd
Dodge Dakota
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3/04/2008
18:43:25

RE: 4.7 Auto Trans
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Depends on what you want to call the # of consecutive forward gears, and if you count the prime gear it downshifts to as a gear. It came with both however.

It's an auto tranny thing.



Kota Kid
Dodge Dakota
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3/04/2008
19:21:15

RE: 4.7 Auto Trans
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Dodge called the 45RFE trans thats in your truck a 4sp trans, but as TexasTodd pointed out it actually has 5 different gear ratios, it has 2 2nd gears to choose from depending on what kind of load is on the engine and a few other factors. Starting in 03, I think thats the right year, they call the trans a 545RFE and also call it a 5sp trans now.



Danpd66
Dodge Dakota
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3/05/2008
10:04:27

RE: 4.7 Auto Trans
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Thanks for the info!



Kowalski
GenIII
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3/05/2008
18:24:20

RE: 4.7 Auto Trans
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2 prime isn't counted as an extra gear. The 45RFE shifts 4 gears up and down sequentially, so it is a 4 speed auto. The 545RFE is a 5 speed. The fact that they select a different second gear when kicking down isn't counted as an extra gear.

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Where Is It
Dodge Dakota
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3/05/2008
19:55:16

RE: 4.7 Auto Trans
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I have a 2004 4.7 with 545RFE. I count four forward gears (three shifts) and then the torque converter locks. That's all I can feel during acceleration, whether easy or hard on the pedal.
If I turn off OD, I feel three forward gears (two shifts) and then the torque converter locks.
Where's the fifth?



Kowalski
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3/06/2008
18:25:34

RE: 4.7 Auto Trans
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Fourth and fifth are pretty close - you might be feeling fifth, when you are thinking you are feeling the torque converter locking. As you are going easy, the torque converter also locks in some of the other gears. Can you feel it locking then ?

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TexasTodd
Dodge Dakota
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3/06/2008
18:59:54

RE: 4.7 Auto Trans
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My truck has the 3 speed behind the four cylinder, so I really don't know what I am talking about.


01 SLT QC, two tone paint,
OEM fender flares
Cab high Leer cap w/ double slider window,
Infinity sound, O/H computer
Tire and handling pack,
Trailer towing pack,

4.7 manual, 3.92 LSD
HO cams,
HO intake,
Ported the stock 68mm TB,
Homebrew 'true' CAI, w/ K&N
No belt driven clutch or cooling fan
No third cat.
SuperChips Tuner

Max dyno, NO short belts, etc.
227 RW HP
300 RW TQ




GraphiteDak
GenIII
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3/09/2008
01:39:40

RE: 4.7 Auto Trans
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BTW. From what I've heard. the ONLY difference in them two tranny's is the programming in the TCM/PCM to add the extra higher OD gear (5th gear). Word has it they added a slightly higher OD ratio to stop some resonance problem the Jeeps had at highway speeds. Jeeps were the first to get the 4.7 from what I remember.

And what Kowalski says seems to be correct.

It locks the converter way before 5th gear on easy throttle. It also will only be int 4th gear for a split second then go into 5th. Every once in a while mine has downshifted into 4th, not counting the converter unlocking.

The Dodge Service manual that someone gave me actually lists the 5 FORWARD GEARS no counting 2nd prime. So it's not a myth.

I do wish it made better use of the 4th gear ratio on mild hills.




Here are the ratios...
545 RFE tranny

Gear Ratios
1st 3.00
2nd 1.67 - upshift; 1.50 kick-down from 3rd (2nd prime)
3rd 1.00
4th 0.75
5th 0.67



Kowalski
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3/09/2008
06:41:36

RE: 4.7 Auto Trans
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Yup, supposedly it was something about the 3.73 rear gear ratio unique to the Jeep that caused the resonance.

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Kota Kid
Dodge Dakota
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3/09/2008
21:46:27

RE: 4.7 Auto Trans
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Wow I didn't know they were double overdrive trannies. Learn something new every day!



GraphiteDak
GenIII
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3/09/2008
22:37:11

RE: 4.7 Auto Trans
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Yeah. But the 4th and 5th gear ratios are so close, and 4th gear seems to be something that the computer seems to never let you use and stay in.

I wish there was a way to let it use the 4th gear OD more often like when towing on the flat and what not. But it is a true 5 speed auto.





choochoo
Dodge Dakota
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3/10/2008
13:56:38

RE: 4.7 Auto Trans
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1st, 1 of 2 2nds, D, OD1, OD2.

I agree there should be better use of OD1.



Danpd66
Dodge Dakota
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3/27/2008
10:05:42

RE: 4.7 Auto Trans
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How is the reliability of these trans? I have an '01 Dak w/ 172,000 miles, 4.7V8 that gave out (and gave out bad). I am putting a 60,000 mile 4.7 out of wrecked '02 and I am wondering how the current trans will adapt to the "younger, healthier" motor? ALL of the miles are highway, 60 miles highway to work, 60 miles highway home. It was never used for towing, just highway commuting. I plan on flushing the trans and replacing the filter, gasket and fluid and I am hoping that it will turn out to be reliable. I plan on flushing the rear axle as well to get the drivetrain as mechanically sound as possible. Seeing's how so many of you know your 4.7 Dak's like the back of your hand, should I be worried about the current trans and axle?

Thanks,
Dan



Kowalski
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3/27/2008
16:21:29

RE: 4.7 Auto Trans
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The tranny seems pretty reliable. I don't have your high miles, but my '00 has held up well for heavy towing and plowing. It has two filters (one is a cannister type), probably a good idea to replace both. The 9 1/4 rear is the stronger of the two possibilities, if that is what you have (twelve bolt, octagonal cover). Some came with the weaker 8 1/4. Either one could eventually have trouble with the carrier bearings. I'm assuming you mean the whole rear end, not just the axles.

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Danpd66
Dodge Dakota
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3/28/2008
09:37:41

RE: 4.7 Auto Trans
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yeah, I meant the whole rear diff.



NEP01
Dodge Dakota
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3/31/2008
20:18:36

RE: 4.7 Auto Trans
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You will be happy to hear that our trans is the same one they are putting behind the new HEMI's. And believe it or not, it is the same basic thing as some of the diesels besides a few parts being beefed up a bit. I dont have the kind of miles you do at all but have always run the crap out of my truck and the tranny is still happy. The rears are very tough. Trans Go sells a basic shift kit that takes care of a few issues, and if you are looking for performance at all, an SCT tuner could be used to help out with shift firmness, not to mention a little more power. But the main benefit for you would be increased line pressure which helps out the holding power to keep things from slipping. Also a quicker shift puts less wear on the clutch packs. There are after market clutch packs out there that are pretty good too. I am waiting for the Red Eagle clutch packs to come out for my high horsepower boosted setup. Ohh, and it should be a 4 speed...

Jason
www.neverenoughperformance.com



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