It all depends on your foot, but on average, I personally didn't notice any
drastic changes in the gas mileage. (Still get an average of 17mpg)
- Bernd
At 12:09 PM 08/11/1999 -0400, you wrote:
>Dont know about the bad gas mileage with the 4.10s. Ive had them for a
>couple of years and I love em. My gas mileage with a 5 spd 360 is about
>12 per gallon. Not great I know, but not much different with my 3.90
>318!
> Now that Ive blown that rearend, Im looking for 4.30's!! Crazy?? I
>love it that way!
>Eric
>Trevor Stott wrote:
> >
> > Errr, doesn't swapping a 3.55 for a 3.90 w/ bigger tires cancel each
> > other out?
> >
> > 3.55's will give decent launch, milage, and towing IMHO
> > 3.90's will give good launch and towing and half way decent gas milage
> > 4.10's will give great launch and shitty gas milage
> >
> > 3.55's 215/75/R15 @2000RPM baseline
> > 3.90's 203RPM more than the baseline to achieve the same speed
> > 4.10's 311RPM more than the baseline to achieve the same speed
> >
> > All depends on what you're after but you can't have your cake and eat it
> > too! :}
> >
> > Trevor.
> >
> > "Bernd D. Ratsch" wrote:
> > >
> > > Yup...swapped to 3.90's and it made a BIG difference. Mileage didn't go
> > > down more than .25 but then again, i'm a little bit of a lead foot. Top
> > > speed will suffer slightly but can be made up for with larger tires. (If
> > > that's the look you want.) If you're just going for pure
> acceleration, the
> > > 3.90's are the way to go.
> > >
> > > Ted...how did your truck run after the 3.55 - 3.90 swap?
> > >
> > > Bernd D. Ratsch
> > > Pflugerville, TX
> > > 1997 Dodge Dakota SLT/CC - 2WD
> > > http://lonestar.texas.net/~bernd/Dakota.htm
> > > bernd@texas.net
> > >
> > > -----Original Message-----
> > > From: owner-dakota-truck@buffnet4.buffnet.net
> > > [mailto:owner-dakota-truck@buffnet4.buffnet.net]On Behalf Of
> > > kwjohn@ais.net
> > > Sent: Tuesday, August 10, 1999 8:43 PM
> > > To: dakota-truck@buffnet.net
> > > Subject: DML: Ring Gear changes: 3.55 vs. 3.90
> > >
> > > HI all,
> > >
> > > Anyone who's made this change to a '97+ w/V6, can you give any
> > > indication of changes in cruising RPM? How about mileage? Top speed?
> > >
> > > I'm looking for better acceleration (without load) and pulling power
> > > (with horse trailer), and I know this is what's needed. Just trying to
> > > understand what to expect. Anyone have a dyno or dragstrip time to show
> > > a difference?
> > >
> > > Thanks
> > > Kurt
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