[AT] OT - Pickup Transmission Question

[charlie hill]

Check the grounds and get it away from AAMCO as soon as possible and 
hopefully before they go into it.  Around here they charge you a small base 
charge to tear into it.  Then tell you  it is going to need a rebuild and 
won't put it back together without a big charge.  Your's may be different.

The speedometer is most likely electronic on a 1990.  Therefore if it is not 
working consistently it stands to reason that it is a ground.  If you can 
get it back from AAMCO before it cost you any money try putting a jumper 
cable or similar ground from the transmission case to a good chassis ground. 
(make sure the connections are good) and see if the problem goes away.

Charlie
----- 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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