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ReedJay
Dodge Dakota
9/07/2001
00:23:40
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 Subject: Ordering...3.55 or 3.92?
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About to place an order for an 02 quad cab, 4.7 auto,LSD, tire & wheel pkg.
Won't do much towing but I do live in the mountains (9000ft) and do a fair bit of mountain driving. I like the power and acceleration of the 3.92 but am concerned about the difference in gas mileage on the highway.
Any comments are appreciated.
Thanks!
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kota on 20s
Dodge Dakota
9/07/2001
02:41:28
|  RE: Ordering...3.55 or 3.92?
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i wish i would have got the 3.92's when i ordered mine. go with them!! at 60mph the engine is only turning 300rpm's higher with the 3.92's, and with the less effort used for exelerating, it offsets the mpg loss on the freeway. someone on here said he went from 3.55's to 3.92's and didnt loose any gas miledge.
Eric
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MAD DUC
Gen III
9/07/2001
07:00:35
| RE: Ordering...3.55 or 3.92?
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Go with the 3.92's,you won't regret it.
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Andy L
Dodge Dakota
9/07/2001
13:57:41
| RE: Ordering...3.55 or 3.92?
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Going with 392's get the possi traction so theat way you can smoke both wheels and not be labeled the 1 wheel wonder
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Andy L
Dodge Dakota
9/07/2001
13:59:37
| RE: Ordering...3.55 or 3.92?
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Going with 392's get the possi traction so theat way you can smoke both wheels and not be labeled the 1 wheel wonder
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surferpug
Dodge Dakota
9/07/2001
17:08:01
| RE: Ordering...3.55 or 3.92?
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Message:
what is the best way of finding out whether I have the 3.55 or 3.92 rear-end. Also what is the best way to ensure that I do indeed have the sure-trac in the rear diff. How much limiting slip factor should the sure-tracs apply cause I can still burn rubber on both tires
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J. C. Brandon
Dodge Dakota
9/07/2001
17:33:07
| RE: Ordering...3.55 or 3.92?
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Andy L:
What you call "possi traction" is available with either gear ratio. ReedJay already said he is planning to get LSD - a limited slip differential. Dodge refers to it as the "anti-spin differential."
ReedJay:
The 3.92s might be the best choice for you. I've got 3.55s and generally lock out the overdrive while driving in the mountains to keep the transmission from shifting too much. The 4.7 has a very peaky torque curve so it does tend to shift gears more than an engine with a flatter curve would.
On the other hand, I've driven the truck at high elevations a lot - including Loveland Pass at 12,000 feet. It performs just fine.
-J.
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Dakota 2 Time
Dodge Dakota
9/07/2001
17:50:44
| RE: Ordering...3.55 or 3.92?
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Message:
Go with the 3.92 and LSD rear. You won't regret it especially on slick surfaces.
97 CC SLT 5.2 Auto 3.55 Brillant Blue/Silver
01 CC SLT 4.7 Auto 3.92 LSD Flame Red/ Silver
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smittyt2
Dodge Dakota
9/07/2001
18:16:42
| RE: Ordering...3.55 or 3.92?
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I definitely wish I would have went with the 3.92 when I purchased my QC. It is only a 40 dollar option from the factory I think. It will cost you close to a grand to have a shop do it for you if you decide later. The 3.92 has a better low end torque from what I have heard.
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Throttle
Dodge Dakota
9/07/2001
21:00:40
|  RE: Ordering...3.55 or 3.92?
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3.92's without a doubt. I also highly recommend the option code Z5P-GVW rating 5900# (gives you 11x2 rear drums instead of the standard 9x2.5 drums) might help with the warped brake syndrome. Oh, this option is 55.00 M.S.R.P/48.00 wholesale. Good Luck!!!
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jeffster
Dodge Dakota
9/08/2001
01:47:29
| RE: Ordering...3.55 or 3.92?
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surfer plug your axle should have a sticker right behind one of the wheels on top of the axle stating the gearing and weather it's open dif or Track loc.
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Dakota 2 Time
Dodge Dakota
9/10/2001
02:31:24
| RE: Ordering...3.55 or 3.92?
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Have to agree with Throttle. I ordered the 2000 LB. payload for the same reason. Another plus is the tires are 235/75 15 Wranglers instead of 215/75 15 and are passable tires. The stock 215 Invictas are garbage. 3.92 LSD with 2000 Lb payload. Of course it goes without saying get heavy duty electrical and cooling. Cheap insurance.
97 CC SLT 5.2 Auto 3.55 Brillant Blue/Silver
01 CC SLT 4.7 Auto 3.92 LSD Flame Red/Silver
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Kraw
Dodge Dakota
9/10/2001
10:26:20
| RE: Ordering...3.55 or 3.92?
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Message:
LSD is also called Sure Grip axle by Dodge
I say get the 3.92's... if you get them and decide you don't want them, I am sure someone would be willing to swap their 3.55's with you..... butt, if you get the 3.55's and decide you wanted the 3.92's, you are looking at a large bill to have them swapped, then you will have to have the dealer do it to keep warranty! (I think)
krawdaddy.net
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Rjay
Dodge Dakota
9/10/2001
11:44:47
| RE: Ordering...3.55 or 3.92?
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Message:
Thanks for the info everyone.
Can anyone tell me what MPG difference I might expect between the two axles ratio's (3.55 vs. 3.92)?
Thanks!
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Mar
Dodge Dakota
9/10/2001
20:05:23
| RE: Ordering...3.55 or 3.92?
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Message:
THe mpg diffrence will be small.
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swampdak
Gen III
9/10/2001
20:20:30
| RE: Ordering...3.55 or 3.92?
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Message:
You will be reving about 250 rpm more at 60 mph with the 3:92,it should not make a big diff but it will make a diff.Maybe 1-2 mpg.
Y2K CC 4.7 AUTO 4X4 3.55 TRAC-LOK SLT K&N 16.35/82.41
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adam
Dodge Dakota
9/11/2001
19:27:57
| RE: Ordering...3.55 or 3.92?
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Message:
the switch seemed to cost me about 1mpg. If you get the 3:92 and decide you don't like them for whatever reason, i have a set of 3:55 for cheap :)
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Rob
Dodge Dakota
9/12/2001
01:57:15
| RE: Ordering...3.55 or 3.92?
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Message:
I've got the 3.55 how much does it cost to change to the 3.92?
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surferpug
Dodge Dakota
9/14/2001
01:22:28
| RE: Ordering...3.55 or 3.92?
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Message:
Anywhere else on the truck that says what the gear ratio is? I think when the anti-rust coating was sprayed the sticker got covered underneath the cr*p.
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swampdak
Gen III
9/14/2001
06:53:43
| RE: Ordering...3.55 or 3.92?
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There should be an equipment sticker in your glove box with all the info you need on it.
Y2K CC 4.7 AUTO 4X4 3.55 TRAC-LOK SLT K&N 16.35/82.41
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dodgenut
Dodge Dakota
9/17/2001
12:29:44
| RE: Ordering...3.55 or 3.92?
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My old dak 5.2L 4x4 cc with 3.92 gears and 31 x 10.50 on it got a pathetic 12 mpg, and that was all highway driving. Cruising at 70mph on the highway the truck was runnning at about 3000rpm, way too high for highway driving. Don't get me wrong it would smoke em any time, and it also had some nice grunt for towing (it pulled my friends 454 chevy home many times.)
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neil Ferido
Dodge Dakota
JOIN HERE
3/24/2002
03:26:55
| RE: Ordering...3.55 or 3.92?
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Message:
i just wanted to know a little about gear ratio.
Which is better 3.73.1, 3.92, or the 4.10 and if the 3.73.1 or 4.10 can be installed in a 2001 dakota cc auto . And about how much horsepower of differnce it would make. Thanks
2001 dakota cc auto
Borla headers and exhaust, 100 shot nitrous, jet stage 2 chip , power aid space, volant intake.just let me know was sup. Thanks again
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Hersbird
Dodge Dakota
JOIN HERE
3/24/2002
13:25:46
| RE: Ordering...3.55 or 3.92?
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The gears don't change the motors HP rating, they do multiply the torque that is sent to the wheels and it is the torque that accelerates the truck. So 3.92s in effect deliver 10% more torque to the wheels. The higher (numerically) the gear the more the mulitplier. The tire diameter will also effect this ratio, The R/T's 28" tall tare combined with the 3.92 is turning the most RPMs on the freeway of all stock Dakotas, so a 4x4 with 31" tall tires can easilly run gears upward of 4.35:1 and still not turn anymore RPM on the freeway then a stock R/T. The place you will lose MPG is only at level steady state freeway crusing. Anything stop and go, or going up hills, is going to get the same maybe better mileage with the 3.92's or higher. The only other consideration with drag racing is you really don't want the truck to have to shift into overdrive just before you go through the traps, but an R/T can even go to the 4.56 gears and stock tires with a PCM upgrade and still not need the OD in the 1/4 mile.
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Neil Ferido
Dodge Dakota
JOIN HERE
3/24/2002
13:49:08
| RE: Ordering...3.55 or 3.92?
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Message:
bro where can I get that 4.56 gear ratio then.
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Hersbird
Dodge Dakota
JOIN HERE
3/24/2002
15:18:34
| RE: Ordering...3.55 or 3.92?
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Message:
www.ring-pinion.com
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Hersbird
Dodge Dakota
JOIN HERE
3/24/2002
15:25:08
| RE: Ordering...3.55 or 3.92?
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That 3.56 on a 28 inch tall tire will run about 3000 rpm when you try to cruise down the highway at 80 MPH. It will seem like a lot of RPM but it's really not that much compared to what cars used to turn before the advent of oderdrive transmissions. It's that same as having a 3.15:1 rear gear on a 60's musclecar, and that would be considered a tame gear back in the 60's.
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n neil Ferido
Dodge Dakota
JOIN HERE
3/24/2002
22:48:15
| RE: Ordering...3.55 or 3.92?
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hey when in ordering thse aftermarkets products . What should i consider beside that damn gas issue everyone talks about. IE rear axle, tires size, torque converter and traction. Would it change these alot
i'm trying to get me those 20 inch r/t wheels frrom speedteawks with 295/45z/20 or 285/45z/20 tires. Any other info will help. Thanks again looking for info before i order it .
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millhouse
GenIII
8/07/2002
17:51:37
| RE: Ordering...3.55 or 3.92?
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Well im have 3.21 Ha I know it does not seem like any one else does But mine have gone south Im now Going w/ 3.92 I was wondering what my top speed is going to be? I can Go 100MPH and 3750RPM how much will that change
Miller
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Boom
Dodge Dakota
JOIN HERE
1/21/2003
18:40:30
| RE: Ordering...3.55 or 3.92?
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Message:
300RPMs higher when going from 3:55 to 3:92.......What about 4:10s?
~15% more torque and 450 more RPMs at 60MPH?
Seems like the 4.10s are even a better way to go.
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