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Old 11-07-2008, 06:29 PM
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1989 th 400

I am putting the final touches on a swap from a 4.3 fuel injected to a 5.7 carbed engine in a 2wd Chev 1/2 ton. pickup. The tranny is the stock th 400 My question is . where is the speedometer cable? I can,t trust the ecm to put 12 volts to the tranny any more so how do I hook it up to my gas pedal? Is there a schematic out there for this application.
Thanks ,Clint

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Old 11-09-2008, 12:43 PM
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Quote:
Originally Posted by price
I am putting the final touches on a swap from a 4.3 fuel injected to a 5.7 carbed engine in a 2wd Chev 1/2 ton. pickup. The tranny is the stock th 400 My question is . where is the speedometer cable? I can,t trust the ecm to put 12 volts to the tranny any more so how do I hook it up to my gas pedal? Is there a schematic out there for this application.
Thanks ,Clint

I do not fully understand the questions.

The 1989 truck would not have a speed-O cable. these trucks are electronic signals from the transmission.

you want 12 volts to the tranny? Is this for the kick down of the transmission?

I do not recall how the kick down voltage was hooked up on the 1989 trucks. Perhaps some one else here can help.

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Old 11-09-2008, 03:14 PM
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1989 I believe the ECM triggered a relay based on TPS to activate kickdown on the TH400.
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Old 11-09-2008, 03:44 PM
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1989 I believe the ECM triggered a relay based on TPS to activate kickdown on the TH400.

would there be room at the gas pedal under the dash for a t-400 switch or is a carb attached kick down the idea?
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Old 11-09-2008, 10:24 PM
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th 400

THanks for the replies. I was having a senior moment while under the truck and not seeing the speedo cable. I am going to put a switch of some sort on the carb linkage to activate the kick down
Thanks. Clint
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