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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