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Question on the 700R4 trans

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Old Dec 6, 2018 | 07:50 PM
  #1  
Ct1987's Avatar
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Question on the 700R4 trans

Hi, I have a 1987 formula with the 305 engine and the Rochester cc carb. I would like to change to an EFI system. My question is, if i remove the carb with all the sensors that the ECM needs, what will happen to my transmission. I understand the ECM controls the lock out, is it using input from one of the carb sensors??

Thanks in advance for your input.

Louis
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Old Dec 6, 2018 | 07:57 PM
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From: Meriden, CT 06451
Car: 84 TA orig. 305 LG4 "H" E4ME
Engine: 334 SBC - stroked 305 M4ME Q-Jet
Transmission: upgraded 700R4 3200 stall
Axle/Gears: 10bolt 4.10 Posi w Lakewood TA Bars
Re: Question on the 700R4 trans

Start here: https://www.thirdgen.org/torqueswitch/
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Old Dec 11, 2018 | 09:52 AM
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From: Chasing Electrons
Car: check
Engine: check
Transmission: check
Re: Question on the 700R4 trans

Originally Posted by Ct1987
Hi, I have a 1987 formula with the 305 engine and the Rochester cc carb. I would like to change to an EFI system. My question is, if i remove the carb with all the sensors that the ECM needs, what will happen to my transmission. I understand the ECM controls the lock out, is it using input from one of the carb sensors??

Thanks in advance for your input.

Louis
TCC lockup is mostly a function of throttle position (TPS), and vehicle speed. The new EFI system should be able to take care of lockup. If not look into a different EFI system.

RBob.
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Old Dec 11, 2018 | 03:02 PM
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From: Los Angeles
Car: 1989 IROC Convertible
Engine: 350 TPI L98
Transmission: WC T5
Axle/Gears: 3.42
Re: Question on the 700R4 trans

The "TV" (?) valve will need to be addressed.
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Old Dec 11, 2018 | 06:18 PM
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Ct1987's Avatar
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Re: Question on the 700R4 trans

Thanks, guys for your input.
Louis
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