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DakQC
Dodge Dakota
JOIN HERE
10/11/2002
20:22:29
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 Subject: 4.7L w/3.55 going to 3.90 or 4.11
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Message:
I have a 01 Dak QC SLT with HD Service group, Tow Package, 4.7L Automatic and 3.55, I am considering changing out my gears for either the 3.90 or 4.11 with Positrac. Reason, towing... Recently while towing my 25' Coleman Caravan through the apalachia mnts I discovered that the 4.7L / 3.55 combo just wasn't enough, one tow I would not want to repeat. My trailer weighs in at ~5200 lbs.
My question is, which gear ratio would be most beneficial. Keep in mind that the truck is driven around town and occassionally on the highway when it isn't towing. Also, is there any benefit to performance by changing out the torque convertor or is the gear ratio where I get the most bang for my buck?
Thanks,
DakQC
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slow2dak
Dodge Dakota
JOIN HERE
10/11/2002
21:37:30
|  RE: 4.7L w/3.55 going to 3.90 or 4.11
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Message:
changing the gears in it will help drastically. a gear swap will make it alot easier to get the truck and trailer moving so u dont have to lug the engine down. a swap to 3.91's would be pretty good. the 45RFE trans had a pretty high 4th gear so u wont see much of an RPM change on the highway, just a few humdred RPM's. also a lower gear in the city will help ur gas mileage by not using as much power to get the truck moving. go with a 3.91.
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Clevite 77
GenIII
10/11/2002
22:32:23
| RE: 4.7L w/3.55 going to 3.90 or 4.11
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Message:
I beleive 3.55's and 3.92's are the only ones available for the 01-03's right now.
Line-X Over The Rail Bed Liner
Home Brew Intake
Dual Exhaust
3923 Autolite Plugs
Krypton 4300K Blue/Whites
Euro Clear Corners
Grille-Tech Grill Insert (Silver)
TPS Set At .705
Removed Rubber Flap
I've used Mobil -1 Full Synthetic Oil And Filter Since I Had 6,000 miles
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Lab Rat
GenIII
10/11/2002
22:52:31
| RE: 4.7L w/3.55 going to 3.90 or 4.11
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Message:
I've seen several manufacturers offering 4.10s for the corporate 9.25" diff. Doing mine when I when I can do without my truck for about a week.
Converters for the 45RFE? None.
LR
Gibson Dual Sport, AirForce One air intake, Jet II, Jet TBS, 180 stat, IAT, TPS, no viscous fan, Lakewood traction bars, "Wilson" antenna ball...when are we gonna see some real parts??!!
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Chipster
Dodge Dakota
JOIN HERE
10/11/2002
23:02:33
| RE: 4.7L w/3.55 going to 3.90 or 4.11
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Message:
I went from 3:55 open, to a 4:10 posi. I have a
2001, Auto with the HO cams & intake. It
makes the truck really fun to drive. It moves the
rpm's up into the power band. If you do alot of
city driving, you won't see very much of a
milage difference. If you do alot of freeway
driving you will lost about 1-1.5 mpg. At 65mph
you will be taching about 2700.
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chris king
Dodge Dakota
JOIN HERE
10/11/2002
23:07:40
| RE: 4.7L w/3.55 going to 3.90 or 4.11
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Message:
go with a set of 3.92s and posi. youll love it!
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xplikt
GenIII
10/11/2002
23:15:50
| RE: 4.7L w/3.55 going to 3.90 or 4.11
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Message:
You can put OEM 4.10 in the corp 9.25 too. OEM just doesn't make 4.56s. Man I would love to test drive a set of those.
2002 2WD RC SLT 4.7L 5spd 3.92 LSD
MBRP Single in/out, straight piped 3rd cat, turndown tip
Hotchkis swaybars and springs
Bilstein custom tuned shocks
Roadmaster Active Suspension
Shaved emblems and antennae
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Clevite 77
GenIII
10/12/2002
02:22:39
| RE: 4.7L w/3.55 going to 3.90 or 4.11
IP: Logged
Message:
Maybe it was for the front differential, does someone make 4.10's for the fronts (01-03)? Sorry for the slip up
Line-X Over The Rail Bed Liner
Home Brew Intake
Dual Exhaust
3923 Autolite Plugs
Krypton 4300K Blue/Whites
Euro Clear Corners
Grille-Tech Grill Insert (Silver)
TPS Set At .705
Removed Rubber Flap
I've used Mobil -1 Full Synthetic Oil And Filter Since I Had 6,000 miles
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Michael
DakotaEnthusiast
10/12/2002
03:14:49
|  RE: 4.7L w/3.55 going to 3.90 or 4.11
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Message:
Where can I find a good set of 3.92 gears and kit to install them.
Thanks,
Michael
PS, sorry to steal you thread just figured i'd ask while we were on the subject.
Z-Tube, R/T Rims, SSB Rear Disc Conversion, Alpine Head-Unit, Infinity Kappa Speakers, SilverStar Headlights, HO Cams & Intake installed.
Got H.O. ?
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DakQC
Dodge Dakota
JOIN HERE
10/12/2002
08:03:09
| RE: 4.7L w/3.55 going to 3.90 or 4.11
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Message:
Yeh, Ring & Pinion has the 4.11 for the 9.25. I was just curious if the 4.11 would be overkill for a daily driver and if it would take too much off the top speed and cause me to lose my ability to travel highway at 75 to 80 moh due to high RPM's. Any ideas?
Thanks,
DakQC
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Lab Rat
GenIII
10/12/2002
09:32:16
| RE: 4.7L w/3.55 going to 3.90 or 4.11
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Message:
Dak,
You can easily guesstimate what the RPM will be. Divide the new ratio by the existing. Multiply that times the RPM at your desired speed, the product is the revised RPM.
Example:
4.10/3.55=1.155
1.155 x 3000 RPM (@90 MPH)= 3465 RPM
Hope this helps.
LR
Gibson Dual Sport, AirForce One air intake, Jet II, Jet TBS, 180 stat, IAT, TPS, no viscous fan, Lakewood traction bars, "Wilson" antenna ball...when are we gonna see some real parts??!!
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DakQC
Dodge Dakota
JOIN HERE
10/12/2002
17:11:09
| RE: 4.7L w/3.55 going to 3.90 or 4.11
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Message:
Chipster - "went from 3:55 open, to a 4:10 posi. I have a 2001"
I am curious to hear more about your experience with the 4.10 posi. I am seriously considering the 4.11 posi and wonder what the RPM's are at 60 and 70 with OD off. I will be towing with this set-up and need the extra pulling power that I think the 4.11 will give over my current set-up (3.55) and possibly even over the 3.92. I can only do this once, so I want to get it right the first time...
Thanks,
DakQC
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dragrdan
Dodge Dakota
JOIN HERE
10/13/2002
03:22:11
| RE: 4.7L w/3.55 going to 3.90 or 4.11
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Message:
for good prices/service check out:
http://www.gearsareus.com/
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smittyt2
Dodge Dakota
JOIN HERE
10/13/2002
09:40:55
| RE: 4.7L w/3.55 going to 3.90 or 4.11
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Message:
I have an '01 QC with the 4.7 and at 70 with the OD off I am hitting right around 3400 I think. With OD on I hit around 2500. Before the gear swap (3.55's to 4.10's) you can subtract 500 from those figures.
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DakQC
Dodge Dakota
JOIN HERE
10/13/2002
12:08:42
| RE: 4.7L w/3.55 going to 3.90 or 4.11
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Message:
Are you conmfortable running 70 MPH with OD Off and sitting at 3400 RPM for a long time. Is there anything I should be concerned with (engine cooling, etc.) with RPM's at 3400 RPM for several hundred miles? I tow with this truck, and when I tow the camper I always turn off the OD. So when I take a trip and average 60-70 MPH on the freeway I am worried that the RPM's may be too high. Any thoughts?
Thanks,
DakQC
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F150
Dodge Dakota
JOIN HERE
10/13/2002
12:11:47
| RE: 4.7L w/3.55 going to 3.90 or 4.11
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Message:
The best gears to get are 3.73s, with a Lightning hooked up to them!
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xplikt
GenIII
10/13/2002
12:44:44
| RE: 4.7L w/3.55 going to 3.90 or 4.11
IP: Logged
Message:
Why 3.73s F150, 4.11s would work a hell of a lot better to tow that POS of yours around ;)
2002 2WD RC SLT 4.7L 5spd 3.92 LSD
MBRP Single in/out, straight piped 3rd cat, turndown tip
Hotchkis swaybars and springs
Bilstein custom tuned shocks
Roadmaster Active Suspension
Shaved emblems and antennae
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DakQC
Dodge Dakota
JOIN HERE
10/13/2002
19:09:28
| RE: 4.7L w/3.55 going to 3.90 or 4.11
IP: Logged
Message:
After crunching some numbers today (actually using an RPM calculator on the internet), theoretically if I were to upgrade the rear on my 4.7L Dak QC, to 4.11 gear I could expect to run 2430 RPM's w/OD at 70 MPH and 3377 RPM's without/OD at 70 MPH. Is 3377 RPM's too high to run for several hundred miles? I am thinking not since I looked at the power/torque curve for the 4.7L, 3377 RPM's actually looks to be the best performing RPM range for the 4.7L. Is this correct?
Thanks,
DakQC
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buddy jones
Dodge Dakota
JOIN HERE
10/13/2002
20:47:03
| RE: 4.7L w/3.55 going to 3.90 or 4.11
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Message:
f150, did you come here to see how bad our daks would stomp your POS?
Just curious, considering that I can take a Lightning by about .5 seconds.
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Livinonline
Dodge Dakota
JOIN HERE
10/13/2002
21:45:39
| RE: 4.7L w/3.55 going to 3.90 or 4.11
IP: Logged
Message:
I asked about this a few weeks ago and everyone said there is not way to put a 4.10 or higher on my 4.7L 4x4.
So has somthing changed?
I would love to go to the 4.10 with my 31" tires. I think I would see a nice increase and with the larger tires I don't think the freeway driving would kill me to badly, specailly as I want to move to the 33"
4" z-tube
70mm TB
HO cams
Gibson Exhaust
Gibson Headers
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DakQC
Dodge Dakota
JOIN HERE
10/13/2002
22:05:04
| RE: 4.7L w/3.55 going to 3.90 or 4.11
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Message:
My Dak is a 4x2. I know that Ring and Pinion (www.ring-pinion.com) has the 4.11 gears to fit the 9.25 rear-end (which I have). I do not know if something is different for a 4x4, but I have been told that I can do this with the 4x2.
I am just trying to gather input from those who have installed the 4.11 gears and how well it does on the freeway.
-DakQC
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POWER HUNGRY
Dodge Dakota
JOIN HERE
10/13/2002
22:31:13
| RE: 4.7L w/3.55 going to 3.90 or 4.11
IP: Logged
Message:
DakQC,
You won't have any problems since you have the tow package, which should come with a trans. cooler. Since you are towing in the mountains you shouldn't lose any mpg with the change. If you are worried about the RPM's you could always go with 3.92's. The rpm's should be 150 less with the 4.11 also with the OD off.
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Texas Todd
Dodge Dakota
JOIN HERE
10/14/2002
10:01:27
|  RE: 4.7L w/3.55 going to 3.90 or 4.11
IP: Logged
Message:
I tach 2075rpm @ 70mph in 5th.
01 QC 4.7 5spd 3.55LSD Tire and handling pack, trailer towing, etc.
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Chipster
Dodge Dakota
JOIN HERE
10/14/2002
14:08:39
| RE: 4.7L w/3.55 going to 3.90 or 4.11
IP: Logged
Message:
OK, I just got off the freeway an here are the
results, with 4.10's and an auto, with stock
tires.
Speed Drive OverDrive
60mph 3050 2250
65mph 3400 2450
70mph 3600 2600
75mph ------- 2800
80mph ------- 3000
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Lab Rat
GenIII
10/14/2002
14:14:40
| RE: 4.7L w/3.55 going to 3.90 or 4.11
IP: Logged
Message:
Chipster,
Good info, is your tranny the 45RFE?
LR
Gibson Dual Sport, AirForce One air intake, Jet II, Jet TBS, 180 stat, IAT, TPS, no viscous fan, Lakewood traction bars, "Wilson" antenna ball...when are we gonna see some real parts??!!
|
DakQC
Dodge Dakota
JOIN HERE
10/14/2002
14:38:13
| RE: 4.7L w/3.55 going to 3.90 or 4.11
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Message:
Chipster - Thanks for the info. Since you put the 4.10's in have you gathered stats on your gas mileage?
I can see where the 4.10's are really do-able. Especially since I only run with OD off when towing and when towing I stick around 65 Mph.
Thanks.
DakQC
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F150
Dodge Dakota
JOIN HERE
10/15/2002
00:28:02
| RE: 4.7L w/3.55 going to 3.90 or 4.11
IP: Logged
Message:
Buddy, stop kidding yourself about taking a Lightning by .5 second. I have owned 4 Daks including an R/T and they couldn't get out of there own way. The Dak is a good grocery getter, not a performance truck.
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buddy jones
Dodge Dakota
JOIN HERE
10/15/2002
17:11:37
| RE: 4.7L w/3.55 going to 3.90 or 4.11
IP: Logged
Message:
f150, my truck is far from stock. Just bring on the lightnings.
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