I believe it came with 215 on 15" rims...
----- Original Message -----
From: "Kenneth Eng" <keng@novadigm.com>
To: <dakota-truck@dakota-truck.net>
Sent: Thursday, June 13, 2002 4:19 PM
Subject: DML: RE: Re: RE: PCM question
>
> Use the tire and wheel calculator to calculate the differences between 2
> tires at
> http://www.dakota-truck.net/TIRECALC/tirecalc.html
>
> The 245 has a circumference of 80.79 inches.
> The 235 has a circumference of 90.72 inches.
> The 255 has a circumference of 88.13 inches.
>
> I don't recall the tires that your Dak was delivered with. If it had the
> 15x7 wheels then it was the 235's. If it was the 15x8 wheels then it was
> the 255's. If it was the 255's then most likely you will not be able to
> reprogram to a smaller circumference. Unless the RT tires are smaller.
>
> You went to a smaller circumference tire from stock. This would cause
your
> speedo to give you a reading that is faster than your actual speed.
> changing from the 255's, if your speedo is now giving you a reading of 71
> mph, you are actually only going 65 mph.
>
>
>
>
>
> -----Original Message-----
> From: Eric Jerman [mailto:ejerman69@hotmail.com]
> Sent: Thursday, June 13, 2002 3:39 PM
> To: dakota-truck@dakota-truck.net
> Subject: DML: Re: RE: PCM question
>
>
>
> So what would I go with if I have 245/40ZR18s? Would I go with 235 or
255?
> Seems like I'd be better off going lower right because it would make my
> speedo read a little fast instead of being a little slow? Thanks for the
> help.
>
>
> ----- Original Message -----
> From: "Kenneth Eng" <keng@novadigm.com>
> To: <dakota-truck@dakota-truck.net>
> Sent: Thursday, June 13, 2002 3:17 PM
> Subject: DML: RE: PCM question
>
>
> >
> > Eric,
> >
> > The only factor that will affect your speedo reading is the
circumference
> of
> > your tires. The size of the rim has no affect if you manage to maintain
> the
> > circumference of the factory supplied tire. The PCM is programmed at
the
> > factory for the specific tire that is delivered with the vehicle. The
PCM
> > is also configured to accept other tire sizes. However, these tire
sizes
> > will only be the ones that are available for the Dak from the factory.
> > These will include the P215, P235, P255, RT tires, and the 31" ones on
the
> > 4x4. If you upgraded to a tire whose size is not one of those listed in
> the
> > PCM, you will then need to select one that is closest in circumference
to
> > the ones you installed. The PCM will need to be reprogrammed by your
> > dealer.
> >
> > HTH,
> > Ken
> >
> > -----Original Message-----
> > From: Eric Jerman [mailto:ejerman69@hotmail.com]
> > Sent: Thursday, June 13, 2002 2:50 PM
> > To: dakota-truck@dakota-truck.net
> > Subject: DML: PCM question
> >
> >
> >
> > Ok,
> > I keep seeing posts on here about a 3.91 gear upgrade...and from what
I
> > understand going from 15" to 18" rims will cause a change in gear
> ratio...do
> > I also need to reset my PCM and if so, how do I do this? Will that
> correct
> > the difference in my speedo?
> > Eric Jerman
> >
> > ----- Original Message -----
> > From: <SEMIHEMI01@aol.com>
> > To: <dakota-truck@dakota-truck.net>
> > Sent: Thursday, June 13, 2002 11:30 AM
> > Subject: DML: Rice for Breakfast.
> >
> >
> > >
> > > Hey Guys,
> > > Can you believe a kid in a low rider Toyota Camry wanted to try on
> the
> > > Dak this morning from a light. I let him have the first run by 2 car
> > lengths
> > > just to make him feel good. Never even made positive manifold
pressure.
> > Then
> > > at the next light, I showed him what the SEMIHEMI could really do. He
> was
> > 2nd
> > > gear history. Damn, I LUV IT. Bill
> > >
> > > SEMIHEMI01@AOL.COM> KB SuperCharged, 4.7L, 2001, QC,
> > > <A HREF="http://hometown.aol.com/semihemi01">the "DAK",</A> <A
> > > HREF="http://southernmopar.org">SouthernMopar</A>
> > >
> >
>
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