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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