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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