well, if the speedo is not working, and the trans is not shifting properly,
the check engine light should be on. even if the check engine light is not
on, it will have a stored code.
get the trouble codes read, and you will find the problem.
but usually, a bad vss will cause the trans to go into "limp mode"
I was able to get hold of a factory service manual which shows that
the VSS is really called the "RABS" - Rear Axle Brake Sensor - which
delivers AC impulses to the "PSOM" Programmable Speed Odometer
Module, so the VSS that is typically mounted on the trans of a
two-wheel vehicle is really the RABS on my 4x4 truck. All I need to do
is to replace the RABS and see if that solves my problem. (I looked
under the truck and found the RABS mounted on top of the Dana 60 rear
end - there is no VSS attached to the trans or Borg Warner transfer
case anywhere to be found).
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