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Old 04-14-2008, 04:01 AM
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Auto Transmissions and Blowers

Hi guys, if you're running an auto with a supercharger I'd like to get some advice on your setups. I've been told to use different setups with regards to valve bodies from engine and transmission builders. Must use a forward or reverse manual vb etc. Can't I just run a vacuum line from under the carb and keep it full auto or is that a no no. Thanks Ron

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Old 04-14-2008, 05:14 AM
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I have a B&M blower on a 383 Chevy in a "T" bucket. I too had heard all kinds of stories and was concerned about using a vac advance distributor and 350 auto trans.

I hooked the vac lines to the baseplate of the carb and have had no problems. Car is driven daily during good weather for many years.
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Old 04-14-2008, 07:49 AM
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The easy answer is to use a modern trans that uses a throttle valve cable instead of a vacuum modulator. This is exactly why GM did away with vac modulators. The turbo and diesel engines would not supply the necessary vacuum, so the throttle valve was incorporated as a fully mechanical replacement for both the vac modulator and the kickdown.

As another option, B&M used to sell a cable-operated replacement for the vac modulator for exactly this sort of application. Don't know if you can still get one or not.
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Old 04-16-2008, 02:27 AM
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Thank you Gentlemen, for your replies.
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Old 04-16-2008, 07:38 AM
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A buddy of mine ran a 700R4 in his blown '73 Chevelle for many years... It was nice to get 18mpg with it and he also ran it weekly at the local track.
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Old 04-18-2008, 10:30 AM
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I have a 6-71 on a SBC in a T bucket and I use a manual shift valve body in a turbo 400.
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Old 04-18-2008, 03:24 PM
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If all else fails, visit BDS for a Trans Differential Valve for automatic transmissions. It works on my Blown 671 Camaro.
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