Eric wrote:
> I did a quick search, and "some guy" said they started using the
> diff sensor in 97, so it think Matt's uses a gear at the trans.
> Somebody here knows for sure.
>
> eric
>
>
>>If the rear on the GenIIs is anything like the GenIIIs then
>>changing gears has zero effect on the speedo because it will auto
>>correct itself for the new gears. Also, unless they bought a
>>programmer of some sort, or had the dealer change the pinion
>>factor in the PCM, there would have to be a correction box wired
>>in to the rear speed sensor to correct the speedo for different
>>tire sizes.
>>
>>brian cropp
>
>
Gen I and II's use a sensor in the tail shaft of the transmission... or transfercase if its a
4x4. This sensor on older Gen I and some Gen II models uses a cable drive for the speedo. On
newer Gen II's the speedo is wire driven - no cable. The ability to correct for tire size can
be done electronically and there are a number of aftermarket gizmos. I don't remember what
year Matts truck is - but if its a 1996 OBD II model - the tire size can be corrected for using
an OBD II type programmer - like my Hypertech Power Programmer I use for the Ram. Otherwise
you can hardwire in a device by Superlift, which is programmable and switchable bwtween tire
sizes. It wires in-line between the sensor and the ECM.
-- ----------------------------------------------------------------------------- "Man is the only kind of varmint [who] sets his own trap, baits it, then steps in it" -John Steinbeck -----------------------------------------------------------------------------
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