[AT] OT - Pickup Transmission Question

[Steve W.]

Sounds like a bad VSS (Vehicle Speed Sensor) Simple bolt on part that
attaches to the rear of the transfer case. Sends vehicle speed to the
computer which displays speed and controls shifting. Wiring may have
been damaged when they pulled the unit to do the trans work.

Steve Williams

Pacifism - The theory that if they'd fed
Jeffrey Dahmer enough human flesh,
he'd have become a vegan.

----- Original Message ----- 
From: "Rob Gray" <Robgray at epix.net>
To: "Antique tractor email discussion group"
<at at lists.antique-tractor.com>
Sent: Tuesday, December 21, 2004 9:33 AM
Subject: [AT] OT - Pickup Transmission Question


> I have a '90 F150 automatic 4X4 which started to have shifting
problems
> the same day as the speedometer started to "bounce" around from zero
to
> the actual driving speed. The transmission continued to shift worse
and
> worse as the speedometer got worse and worse until the speedometer
> stopped working at all and I could barely drive the thing due to
> extremely off-timing gear shifting. This was supposedly one of the
first
> years for Ford's electronic transmissions so I'm guessing that these
> trucks use the  speedometer to assist the auto tranny in "knowing"
when
> to shift?
>
> I left it at AAMCO and they said that they have to open up the
transfer
> case and take a look. Has anyone experienced this sort of problem
before
> that could give me any insights as to how big a job it was to get
> fixed....? I just had the torgue converter on the transmission
replaced
> 6 months ago and with a truck this age I'm somewhat leery of digging a
> hole too deep expense-wise... Maybe I should park it out in the field
> and start one of those old vehicle "collections" you see on some
places
> here and there.... ;)
>
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