Bronco

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Brad and Mia - 31 Oct 2004 06:30 GMT

Why would a 1980 Bronco produce a whistle that goes up in pitch after the
auto changes gears. It stops before the shift, but then will always start
again. Obviously, I'm thinking vacuum, but have no idea where to start to
look.

Thanks anybody!

Brad

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el Diablo - 01 Nov 2004 13:17 GMT

> Why would a 1980 Bronco produce a whistle that goes up in pitch after the
> auto changes gears. It stops before the shift, but then will always start
[quoted text clipped - 4 lines]
>
> Brad

Try the transmissions vacuum modulator.

Brian

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Brad and Mia - 02 Nov 2004 03:56 GMT

>> Why would a 1980 Bronco produce a whistle that goes up in pitch after the
>> auto changes gears. It stops before the shift, but then will always
[quoted text clipped - 10 lines]
>
> Brian

Never heard of it, but I have the shop manual and will find it. Thanks man!

Brad

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el Diablo - 02 Nov 2004 10:49 GMT

> >> Why would a 1980 Bronco produce a whistle that goes up in pitch after the
> >> auto changes gears. It stops before the shift, but then will always
[quoted text clipped - 14 lines]
>
> Brad

I don't know where it's located exactly on the Ford transmission, but the
are small canisters about 2 to 3 inch diameter with a vacuum line running to
them. They aid in smoother up shifts and shift timing due to the amount of
engine vacuum that they receive. That's why my guess to look there.

Brian

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