Here's a pseudo repost, hope it helps.
Jetmugg@aol.com writes
>> What you will need to do to get the speedo right is get the correct
speedo
pinion gear. Here's a quick formula for determining the tooth count of the
gear that you will need.
Tooth count = (265 x Tire Height (in.)) / Axle Ratio.
Then go to your local Mopar parts counter, and have them look up the part #
for the speedo pinion gear with the correct tooth count.<<
-Jay
> -----Original Message-----
> From: McKinney, John R. MHX [SMTP:McKinJr@hpd.abbott.com]
> Sent: Thursday, September 09, 1999 10:26 AM
> To: 'dakota-truck@buffnet.net'
> Subject: DML: RE: PCM Info: DML Digest V4 #939
>
> Is there something that we need to adjust on the computer if we are
> running
> different size tires, or is this just for calibrating the speedo?? Since
> I
> put the 33's on my truck, my speedo is 5mph low, but seems to run the
> same.
> Anybody know??
>
> John McKinney
>
> > -----Original Message-----
> > From: Martin Tolentino Jr. [SMTP:martindtjr@home.com]
> > Sent: Wednesday, September 08, 1999 3:19 PM
> > To: DML; DakotaRT; CaDakota
> > Subject: DML: PCM Info: DML Digest V4 #939
> >
> > One other thing is he adjusted the computer as close as he could
> > for my new tire size there 275 40vr 17". He said it was too far out of
> > the DRB3 range.
> >
> > Later
> >
> > Martin Tolentino
> > 99 Dakota R/T CC
> > 90 Laser RS-T fwd
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