> -----Original Message-----
> From: Matt Beazer
> Sent: Saturday, May 09, 2009 2:32 AM
>
> Some clarifications:
>
> * My truck is a 1995 Dakota Sport 318 automatic
> * It has 31" tires on it on stock chrome rims
> * Per the FSM, it is an electronically driven speedometer that runs off
> the vehicle speed sensor, per section 8E page 8E-2: "The VSS is mounted
> to an adapter near the transmission (two-wheel drive) or transfer case
> (four-wheel drive) output shaft. The sensor is driven through the
> adapter by a speedometer pinion gear.
That's the way my '92 Dak is set up. I changed the speedometer gear when I
went to taller tires and a 4.30 gear.
> according to the
> FSM you can "index" the pinion adapter that bolts to the speed sensor
> for different "speedometer pinions" that look to be plastic gears for
> different tire sizes/gear ratios with different numbers of teeth.
They are also different colors. The "indexing" is done per the number of
teeth on the speedometer gear used.
Here's a couple sites that may help you.
http://jeepsunlimited.com/zj/speedo/speedo.htm
http://www.tciauto.com/Products/TechInfo/speedo_gears.asp
Ray
http://www.dragtruk.com/ENTRIES/20KM1FD2KWBP.html
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