There is a table entry for your tires that needs to be set by the dealer.
It's the 5th entry or 31x10.5x15. The entry you have is too far off and
your computer and CABS system is smarter than you think. The sensor in the
back figures your revolutions per mile but the sensors in the front compute
your actual revolutions to the mile and compares the two and will set an
MIL. As for a speedo gear there's no such animal on the 2000's. The PCM
gets all the calculations for mileage from the RWSS near the ring gear and
the CABS computer. Comparisons are made to the FWSS's and information is
stored in the PCM.
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@bent.twistedbits.net
[mailto:owner-dakota-truck@bent.twistedbits.net]On Behalf Of Korey
Atterberry
Sent: Wednesday, November 06, 2002 8:15 PM
To: dakota-truck@dakota-truck.net
Subject: DML: Tire size - speedometer recalibration
Hey all-
I'm looking to replace my 255/65/15's with 30x9.5x15 BFG AT KO's, and
my concern is that my odometer/speedometer, etc. will be off. The
stock tires are 28" tall, and the 30's are actually 29.5", so I'm
looking at a 5% difference. BTW - I drive a 2000 2WD.
My concern is that I'll have problems when I go to sell the truck for
the odometer misreporting. Is there a "legal" limit? 5% too much?
I called three different dealerships. One didn't know the first
number in P-metric tire sizes means the width, the second thought 1/4"
difference in height would cause a 5mph difference, and the third
didn't know the Dakota was sold with the 255/65/15's. Needless to say,
none of them could tell me if 5% was too much out of spec, and if it
were, whether a computer flash was required (or available) or if I
needed to change the speedo gear.
I've also heard going up a size or two can cause problems with the
ABS computer, but I don't really see how, since I'm getting a set of 4.
I kinda figured the truck's computer would just figure that I'm
driving a little slower and hauling a little more load and adjust
accordingly.
Any thoughts,
Korey
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