Thanks for the info, I did not know that. Since I ordered my truck with the
31" tires and the 3.92 gears, it looks like I'll have to look into getting
one of those "adjustment boxes you referred to.
Thanks!
John McKinney
> -----Original Message-----
> From: Craig Baltzer [SMTP:Craig.Baltzer@anjura.com]
> Sent: Thursday, September 09, 1999 9:25 AM
> To: 'dakota-truck@buffnet.net'
> Subject: DML: RE: RE: RE: RE: PCM Info- speedo gear
>
> Dodge stopped using the "replacable" pinion gears in '98 (i.e. you can get
> them for a '97, but there is a new electronic sending unit in the '98s).
> For
> the '98s, the "adjustability" in the PCM is whatever the stock tire sizes
> were. You can also set the axle ratio with in the PCM, so between the two
> you have a bit of adjustability (i.e. for really big tires, pick the
> largest
> tire and the lowest axle ratio)...
>
> FYI, if you look in the back of "Truck'n" mag (or most other off road
> mags)
> they have a number of "electronic" adjustment boxes for getting the
> speedos
> corrected for larger tire sizes. These splice into the signal line between
> the transmission speed sensor and the PCM. About $50-60 if I remember
> correctly...
>
> Craig
>
> -----Original Message-----
> From: McKinney, John R. MHX
> To: 'dakota-truck@buffnet.net'
> Sent: 9/9/99 11:32 AM
> Subject: DML: RE: RE: RE: PCM Info- speedo gear
>
> Thanks for the info, I was actually already going to get the gear from
> the
> dealer, but if you read the post at the bottom from Martin Tolentino, he
> says something about the dealer adjusting the computer as close as he
> could
> for the size tires he has and something being too far out of the DRB3
> (?)
> range. Anybody know about this?? I have 33" tires now and am sure they
> would be out of range.
>
> John McKinney
>
> > -----Original Message-----
> > From: Mooberry, J [SMTP:j.mooberry@lmco.com]
> > Sent: Thursday, September 09, 1999 7:52 AM
> > To: 'dakota-truck@buffnet.net'
> > Subject: DML: RE: RE: PCM Info: DML Digest V4 #939
> >
> > 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
> >
> >
> > > > 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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