'88 Crown Vic Tranny shifting hard

'88 Crown Vic Tranny shifting hard - AOD

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t@rogers.canada - 09 Nov 2004 12:57 GMT

Greetings:

Bought this car 6 years ago with a blown tranny. Swapped it out with a

rebuilt unit, and it lasted about 11 months. Took the car back to Mr
Transmission
and they put in another rebuilt unit. Last 5 years it's been fine.

Got into the car yesterday and now it won't shift into second until
the
car reaches about 30 MPH, and into 3rd unitl about 45 MPH. When it
does shift, it feels like a shift kit was installed! Took it up to 70
MPH and
it won't shift into OD.

I'm not all that familiar with the AOD, but it's acting like the
vacume modulator
is bad on a C4 (which I have on my built up '78 Mustang). The cable
"kick-down"
seems to be operating fine. Fluid is up.

Any ideas?

Thanks,

Tedd

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Sharon K.Cooke - 09 Nov 2004 13:39 GMT

If you have the AOD trans that mates to the 302 engine, it's most likely
that the TV gromment has given up. See:
http://www.lincolnsonline.com/article52.html

> Greetings:
>
[quoted text clipped - 22 lines]
>
> Tedd

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t@rogers.canada - 09 Nov 2004 14:07 GMT

> If you have the AOD trans that mates to the 302 engine, it's most likely
> that the TV gromment has given up. See:
> http://www.lincolnsonline.com/article52.html

Hi Sharon:

Thanks for the tip! Just curious though, with the spring return on the
cable, wouldn't the tranny be in non-kick-down posistion, making the
shifts earlier instead of later?

I just called the ford dealer here in Ontario, and sure enough, they
are only CAN$1.73 each, BUT I have to buy a package of four.

Incredible.

Thanks,

Tedd

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MasterBlaster - 09 Nov 2004 15:17 GMT

> > If you have the AOD trans that mates to the 302 engine, it's most likely
> > that the TV gromment has given up. See:
[quoted text clipped - 3 lines]
> cable, wouldn't the tranny be in non-kick-down posistion, making the
> shifts earlier instead of later?

It's not a "kick-down" cable. It controls the shift points by altering the internal
oil pressures based on the throttle position. Those oil pressures also control
how hard the clutches and bands clamp when applied. If the grommet comes
apart and the cable disconnects, the trans thinks you're at idle, and applies
very little clamping pressure, which can allow the clutches to slip like crazy
as the transmission burns itself up.

Is the cable still connected to the lever at the throttle body? If not, the gas
pedal pressure should be considerably lighter than usual. It's also possible
the cable or linkage has disconnected further down, underneath the car.

It's also possible that it's just a "normal" trans problem, not cable-related.

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t@rogers.canada - 09 Nov 2004 23:48 GMT

> It's not a "kick-down" cable. It controls the shift points by altering the internal
> oil pressures based on the throttle position. Those oil pressures also control
> how hard the clutches and bands clamp when applied. If the grommet comes
> apart and the cable disconnects, the trans thinks you're at idle, and applies
> very little clamping pressure, which can allow the clutches to slip like crazy
> as the transmission burns itself up.

Now I get it! Thanks for the great description.

> Is the cable still connected to the lever at the throttle body? If not, the gas
> pedal pressure should be considerably lighter than usual. It's also possible
> the cable or linkage has disconnected further down, underneath the car.

I haven't checked yet, as we just got our first blast of snow. I can
grab
the cable terminator and give it a pull, and it snaps right back

> It's also possible that it's just a "normal" trans problem, not cable-related.

I don't even want to go there. If it is the tranny again, it will be
used as
a demolition car and I'll start looking for a 1999 or 2000 CV.

Thanks again, Tedd

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trainfan1 - 10 Nov 2004 01:42 GMT

>>It's not a "kick-down" cable. It controls the shift points by altering the internal
>>oil pressures based on the throttle position. Those oil pressures also control
[quoted text clipped - 22 lines]
>
> Thanks again, Tedd

The 2001 & up CV has the PI (product improved) engine, & other enhancements.

Rob

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