You have to recalibrate the computer, at least on '98s and '99s. And
the computer only can be set to tire sizes that come from the factory
(they're pre-set, the dealer just turns the right one on).
Jonathan Nelson wrote:
>
> thanks for the help. Now I've got another one.. :) What do you do to correct
> the speedo if you change tire sizes. I just got a set of R/T rims to replace my
> 15x8 factory rims. I am going to put 275/40R17 bridgestone RE730's on them.
> the tire change compared to my factory 255/65R15 changes the diameter of the
> tire by over 2 inches and will make the speedometer off by a little over 9%
> using the auto math handbook. I'm sure you 4x4 guys have run into this
> problem.. ???????
>
> thanks,
> jon
>
> P.S. if anyone in the oregon area is interested in the old 15x8 factory rims
> and 255/65R15 tires (9500 miles on them, good shape) let me know.
>
> Ronald Wong wrote:
>
> > Your dealer was correct. There is nothing you need to do. Your speedometer
> > is still correct.
> >
> > Ron
> > 00 PB SLT QC 4X2 5.9 46RE 3.92 LSD
> > For modifications see my DML Profile (URL follows)
> > http://www.twistedbits.net/WWWProfile/dakota/Kw9pV1EkFeOYY
> >
> > -----Original Message-----
> > From: owner-dakota-truck@buffnet.net
> > [mailto:owner-dakota-truck@buffnet.net]On Behalf Of Jonathan Nelson
> > Sent: Wednesday, February 07, 2001 2:31 PM
> > To: dakota-truck@buffnet.net
> > Subject: DML: speedometer help!!!!
> >
> > Hey guys, hopefully someone out there can help me. I have a 2000
> > regular cab SLT+ with the 4.7L and the 5-speed manual tranny. I
> > replaced the factory 3.55's in the rear with a set of factory 3.90's out
> > of a similar truck that someone wrecked. How do I go about fixing the
> > speedometer? is it a normal speedo gear setup, or otherwise? I talked
> > to my local dealer but he was pretty much useless. he did say something
> > about the speedometer takes its signal off the rear wheels which didn't
> > make much sense to me. Help!!!!
> >
> > Thanks,
> > Jon
> >
> > ************************************************
> > Jonathan Nelson
> > Oregon State University
> > Department of Mechanical Engineering
> > Formula SAE Team Captain
> > nelsonjo@engr.orst.edu
> > formula@engr.orst.edu
> > (541) 754-9584
> > office: 132 Rogers Hall
-- -andyhttp://home.twcny.rr.com/andylevy/ --- andylevy@bigfoot.com ------------------------------------------------------------- modesty, n.: Being comfortable that others will discover your greatness -------------------------------------------------------------
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