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Kevin
Dodge Dakota
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9/13/2003
15:39:42
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 Subject: RE: Rear end ratio - 3.92 or 4.11?
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Message:
Well,
Lots of good info here. I have a 99 V6 CC running 275/60 R15s
( http://webpages.charter.net/khoegen )
I checked my glove box today and this is what I have:
DMC - Axle Ratio 3.21
DRA - Rear Axle Chrystler 8.2
The reason I mention this is that I want to convert to a limited slip before the winter, and seeing that the shop will be doing this, I figured it couldn't hurt to change the ratio as well.
Currently I do alot of highway driving (2hours daily), but this truck off the line is terrible. Most folks I talk with recommend the 3.92....from a gas mileage perspective, how much should I expect to lose? I'm guessing even the 3.55 is better than what I have now...but then again, everyone who has the 3.55 seems to want to go one higher :-)
Any input is appreciated...including where I should get all this stuff from. I know very little about gears and differential work, but I wanted to buy what I need online then have a shop do the install.
Thanks for the assist in advance.
Kevin
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01Motorsport
Dodge Dakota
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9/14/2003
08:30:48
| RE: Rear end ratio - 3.92 or 4.11?
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There's about 300 more rpm on the highway with a 3:92 compared to a 3:55. Unless you are driving over 80 mph(!) a lot, the 3:92 is a great gear. I can't believe someone put a 3:21 on a V-6. That would actually hurt the mpg, especially in the city.
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Kevin
Dodge Dakota
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9/14/2003
09:18:52
|  RE: Rear end ratio - 3.92 or 4.11?
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01Motorsport
Your not kidding about the MPG....it is terrible, especially for a V6. Not only that, but I have done a number of mods to increase performance (Bored TB, K&N Air Intake, Flowmaster Cat-back, cooler plugs...and my buddies 99 V6 still kills me off the line.
Granted, it is a V6 so I don't expect to be matching up with an RT, or racing anything for that matter. But the Dakotas in general are 'peppy' trucks, and I'd like to see some of that off the line.
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01Motorsport
Dodge Dakota
JOIN HERE
9/15/2003
22:16:48
| RE: Rear end ratio - 3.92 or 4.11?
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Message:
You can lower the effective gear ratio slightly by going to 255/60/15 tires.
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Kevin
Dodge Dakota
JOIN HERE
9/16/2003
06:10:04
| RE: Rear end ratio - 3.92 or 4.11?
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Message:
I'm actually running 275/60 R15s right now.
What does that do to the effective gear ratio?
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Mark
Forum Moderator
9/16/2003
08:18:08
| RE: Rear end ratio - 3.92 or 4.11?
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Message:
Kevin, I have 275 60 15's as well and they dont effect anything because they are the same diameter as the stock 215/75/15's at least on mine. I did do a swap recently from 3.50 to 3.92 and it didnt have a negative effect on highway drivability. The speedo is a little off though. Its off by about 10 percent.
-Mark Hryckiewicz
1993 Sport RC SB 5.2L Auto
DodgeDakotas.com
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MAGNUM S/T
Dodge Dakota
JOIN HERE
9/16/2003
08:26:31
| RE: Rear end ratio - 3.92 or 4.11?
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I expect my speedo will need some type of recal...since I am jumping from 3.21 to 3.92. It's probably gonna be more than a 10% difference.
Any suggestions
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Frank Faris
Dodge Dakota
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1/18/2013
18:05:00
| RE: Rear end ratio - 3.92 or 4.11?
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my 2001 dodge dakota has the 3.21 posi i get great
mpg out of it. usually 500 miles out of a tank. it
has a bored out v6 with holley throttle body, and
python fuel injectors and accel ignition and a 5
speed mated with a hurst shifter. got 255/70/15 108s
tire and it has great take off too
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Sam
Dodge Dakota
JOIN HERE
1/27/2013
21:47:22
| RE: Rear end ratio - 3.92 or 4.11?
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FRank Faris where did u purchase your python
injectors? did u see a power increase from the
upgrade?
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Frank Faris
Dodge Dakota
JOIN HERE
1/28/2013
06:43:00
| RE: Rear end ratio - 3.92 or 4.11?
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just type in python fuel injectors on any search
engine. i noticed a big change in throttle response.
but it got alot quicker when i put in the 52mm
holley throttle body
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