TH400 modulator to TV cable conversion???? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-29-2004, 06:45 AM
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Question TH400 modulator to TV cable conversion????

Does there exist a conversion that will convert a TH400 from vacuum modulator to a TV cable operation.

Problem being very low manifold vacuum at idle ~10" which results in the modulator being inactive -allowing highest possible pressure at idle => hard jerk when shifting into "D" at idle.....

Kinda annoying....

thx

Bjarne

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Old 04-29-2004, 11:14 AM
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Not that I am aware of. I am swapping a 350 in place of my 700 in a couple of months, and I was thinking about that too.

One option is a vacuum pump. If you have power brakes (like me) you would also benefit from full brakes as well.

Not sure how much parasitic loss they have though.

Tom
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Old 04-29-2004, 06:12 PM
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Cool

there was a mechanical modulator sold years ago. I am not sure what company sold it, it may have been B&M .

It replaced the modualtor and had a cable that attached to the carb just like the detent / TV cable you are familar with.

There is a low vacuum modulator available that may help your situation. It is adjustable . The unit has a black and red stripe on it , where the common aftermarket modulator has only a red stripe.
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Old 04-29-2004, 11:48 PM
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Quote:
there was a mechanical modulator sold years ago. I am not sure what company sold it, it may have been B&M
I also heard about this, but cannot find anything about it on the internet.....

Quote:
There is a low vacuum modulator available that may help your situation. It is adjustable .
Where can I buy this one?

I searched the internet for it also but cannot find it...

Can someone please direct me to a store?

Living in Denmark, there are impossible to get over here...

Thanks!
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Old 04-30-2004, 06:18 AM
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Cool

Start here for tranny parts. Perhaps they would ship to you :


http://www.natpronet.com/
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Old 04-30-2004, 04:11 PM
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Doing a search to try and help you out, I ran across this. A rather good article about it. TV cable Another article Some reading HERE with some e-mail addy's that maybe someone may be able to help you out
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Old 04-30-2004, 06:32 PM
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Cool

Kevin45....

all of the info on those page URL's you posted are for a t-200-4r or a 700 tranny,

the guy is looking for a mechanical replacement for a vacuum modualtor on a T-400 that was sold years ago. It was often used in a super charged / blown applications where a vacuum source was not available.

He could use a low vacuum modualtor as I posted or convert the T-400 tranny to full manual
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