th350 / th400
TECH Junkie
Joined: Jun 2008
Posts: 3,202
Likes: 1,390
From: Nitro Alley
Just in case you did not know; the THM400 transmissions do not use any linkage or cable for high-speed down-shifts.
A vehicle originally equipped with the THM400 transmission will have an electric switch on the accelerator pedal to close a circuit going into the transmission and operate a down-shift solenoid on the valve-body.
When swapping the THM400 into a vehicle; a micro-switch on the throttle-body or carburetor throttle-plate will serve the same purpose, instead of an electrical switch on the accelerator pedal. You can use the micro-switch that is commonly sold for nitrous-oxide use.
Now for the THM350, make sure to purchase a down-shift/ kick-down cable.
You do NOT have to purchase a throttle-valve cable, as for the THM700-R4/ THM200-4R transmissions.
A vehicle originally equipped with the THM400 transmission will have an electric switch on the accelerator pedal to close a circuit going into the transmission and operate a down-shift solenoid on the valve-body.
When swapping the THM400 into a vehicle; a micro-switch on the throttle-body or carburetor throttle-plate will serve the same purpose, instead of an electrical switch on the accelerator pedal. You can use the micro-switch that is commonly sold for nitrous-oxide use.
Now for the THM350, make sure to purchase a down-shift/ kick-down cable.
You do NOT have to purchase a throttle-valve cable, as for the THM700-R4/ THM200-4R transmissions.
Thread Starter
TECH Apprentice
Joined: Jul 2017
Posts: 312
Likes: 14
From: Stephens city VA
just in case you did not know; the thm400 transmissions do not use any linkage or cable for high-speed down-shifts.
A vehicle originally equipped with the thm400 transmission will have an electric switch on the accelerator pedal to close a circuit going into the transmission and operate a down-shift solenoid on the valve-body.
When swapping the thm400 into a vehicle; a micro-switch on the throttle-body or carburetor throttle-plate will serve the same purpose, instead of an electrical switch on the accelerator pedal. You can use the micro-switch that is commonly sold for nitrous-oxide use.
Now for the thm350, make sure to purchase a down-shift/ kick-down cable.
You do not have to purchase a throttle-valve cable, as for the thm700-r4/ thm200-4r transmissions.
A vehicle originally equipped with the thm400 transmission will have an electric switch on the accelerator pedal to close a circuit going into the transmission and operate a down-shift solenoid on the valve-body.
When swapping the thm400 into a vehicle; a micro-switch on the throttle-body or carburetor throttle-plate will serve the same purpose, instead of an electrical switch on the accelerator pedal. You can use the micro-switch that is commonly sold for nitrous-oxide use.
Now for the thm350, make sure to purchase a down-shift/ kick-down cable.
You do not have to purchase a throttle-valve cable, as for the thm700-r4/ thm200-4r transmissions.
TECH Junkie
Joined: Dec 2012
Posts: 3,614
Likes: 1,326
From: Iowa
Just block the low-control valve inboard on the th350 and then you can manually downshift any time you want/need
The kickdown cable in a th350 is not needed (unlike the 700r4 where it's a necessity)
The kickdown cable in a th350 is not needed (unlike the 700r4 where it's a necessity)
This^^^^^ Don’t forget to remove the kick down rod/pin and plug the hole. ICT Billet makes a real nice o-ringed plug for that hole. You can pull the pin up and cut it off with with good wire cutters vs removing the pan.
