Automatic Transmission weird shifting

Automatic Transmission weird shifting

1990 Ford Ranger 4X2 Super Cab V 4.0L
A4LD Transmission

My vacuum modulator failed, automatic transmission fluid was being sucked
into the intake. The part has been bad for a good while about a year. I
discovered it as my fluid level has been slowly dropping over the last year.
The truck ran fine.

I purchase the part, Niehoff # TM115 fits 1987 - 1990 Ranger, when I ordered
the part, there were two to choose from; Niehoff also had a TM332 which was
for 1983- 1996 Ranger. Not sure what the differences are, altitude?

When I went to replace it things were tight with the cat so I took it to a
transmission shop gave them the part and they installed it. The also changed
the few inches of vacuum hose at each end of the hard-line as they were full
of transmission fluid.

As I drove away from the shop I noticed that at 15 mph it would shift into
2nd (which is normal), then at about 22mph the rpms would go up a good bit,
was it shifting back to 1st? Then after 1-2 seconds it would shift back into
2nd. Then as I would pick up speed it would go into third. This was Sat and
the shop closed as I left, so I couldn't go back.

It repeats this pattern every time, I drove around all day and it would do
it every time. If I took off and kept my foot into the throttle a bit it
would not happen. It happens if just drive easy.

The truck never did this before. At first I thought that I was getting use
to normal shifting since the vacuum modulator was replaced, but the more I
drove it I know that this rpm increase, slipping sensation was not normal.

So what could be wrong? Did I put in the wrong part? Is the new part bad? Is
there an adjustment involved?

And I did check to see that my transmission fluid is at the correct level.

"Tube Audio" > wrote in message news:2XKyj.11558
> So what could be wrong? Did I put in the wrong part? Is the new part bad?
> Is there an adjustment involved?

I dont know if it is the right part or not.. I could possibly be the wrong
one for
that tranny. You should be able to check that possibility by taking the
actual
number off the tranny and going back to the parts book.

Ford has put together some trannies, the innards of which are not what you
might expect. A professional mechanic friend of mine recently ran into that
and it threw him for a loop, for a while.

But, there IS an adjustment involved, usually. There is often an adjusting
screw
inside the vacuum modulator where the hose slips on.

I found out that I did have the wrong part, it should have been the Niehoff
TM332, the store sole me the TM115.

i'm thnk of just getting the Motorcraft TM74 part.

Does anyone know if the TM74 has an adjustment screw?

Thanks




"HLS" > wrote in message
. net...
>
> "Tube Audio" > wrote in message news:2XKyj.11558
>> So what could be wrong? Did I put in the wrong part? Is the new part bad?
>> Is there an adjustment involved?
>
> I dont know if it is the right part or not.. I could possibly be the wrong
> one for
> that tranny. You should be able to check that possibility by taking the
> actual
> number off the tranny and going back to the parts book.
>
> Ford has put together some trannies, the innards of which are not what you
> might expect. A professional mechanic friend of mine recently ran into
> that
> and it threw him for a loop, for a while.
>
> But, there IS an adjustment involved, usually. There is often an
> adjusting screw
> inside the vacuum modulator where the hose slips on.

Take it to a Dr.Transmission shop.
cuhulin

"Tube Audio" > wrote in message
et...
>I found out that I did have the wrong part, it should have been the Niehoff
>TM332, the store sole me the TM115.
>
> i'm thnk of just getting the Motorcraft TM74 part.
>
> Does anyone know if the TM74 has an adjustment screw?
>
> Thanks
>

I dont know. I havent worked on auto trannies in a long time, but back in
the
dark ages, almost all of them DID have an adjusting screw where I told you
to
look. You accessed them with a very small screwdriver, and adjusted them -
if necessary - to suit your demands. You couldnt preadjust them any set
number
of turns or anything like that. It was done with the modulator in the
tranny and
the car running.