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Correct Carb ordered, what else do I need?

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Old Sep 19, 2013 | 12:03 PM
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Default Correct Carb ordered, what else do I need?

I've ordered the correct model carb for my 70 350/300 AT AC car. Previous owner installed 78 Carter (350/185hp). I ordered a correct rebuilt Rochester Quadrajet 7040202. From what I can determine the 7040212 never existed that the Black Book shows to be correct for my build date of June 70. Manufacture date is later than my car should have but it should work well for mine.

At present passing gear doesn't kick in with Carter carb. Originally, what controlled passing gear on the TH400 and what else might I need to purchase to make it work?

Also, originally, did it have a mechanism to increase idle with AC on?

I can't seem to locate a good illustration of these components that were probably removed with the original carb.

By the way, an ASE mechanic I used a few weeks ago said the modulator controlled the passing gear and replaced the modulator, fluid and filter and still no passing gear!
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Old Sep 19, 2013 | 12:20 PM
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The passing gear is controlled by an electric switch attached to the gas pedal.

http://willcoxcorvette.com/product_i...oducts_id=4648

here is the solenoid

http://www.ecklerscorvette.com/corve...tabs-container

Last edited by MelWff; Sep 19, 2013 at 12:27 PM.
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Old Sep 19, 2013 | 01:01 PM
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Thanks MelWff,

Can you direct me to the wiring diagrams for these components or tell me how many wires go to the pedal switch?
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Old Sep 19, 2013 | 01:51 PM
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The switch has a 2 wire connector probably dangling somewhere under the dash
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Old Sep 19, 2013 | 07:08 PM
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The wiring is plugged in. Disconnected and tested power. has almost 12 volts running to it.

Think the switch itself is bad or something between it and the transmission or in the transmission itself?
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Old Sep 19, 2013 | 08:43 PM
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Originally Posted by eot52
By the way, an ASE mechanic I used a few weeks ago said the modulator controlled the passing gear and replaced the modulator, fluid and filter and still no passing gear!
so, what did he say when you took it back and said you paid for this repair that didnt repair anything?
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Old Sep 19, 2013 | 09:20 PM
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The shop owner basically escorted me out and he said he would make it right the next time I came in for repairs. I said there wouldn't be a next time.
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