Does a Turbo 400 have a detent cable?
When the throttle linkage reaches a specific point, the cable triggers a mechanical detent valve inside the transmission–allowing it to shift into a lower gear. The Turbo 400 uses an electric switch to trigger a detent solenoid on the valve body to produce the same effect.
Does a TH400 have a passing gear?
I know that the TH400 has an electronically-controlled passing gear with some sort of switch under the dash, but where is the switch and what should I be looking for? The carbeurator is a new Edelbrock Quadrajet, but passing gear never worked w/the original Quadrajet either.
How does kickdown solenoid work?
A kick down solenoid is provided in the first shift down circuit for controlling the first shift down circuit and a kick down switch is adapted to be actuated by an engine control member.
What does the vacuum modulator do on a Turbo 400?
The vacuum modulator is a vital component of automatic transmissions. It tells the transmission what kind of load is being put on it, allowing the transmission to react with the proper line pressures and shift points.
What does a kickdown switch do?
When the accelerator pedal is pressed all the way to the floor (beyond the position normally regarded as full acceleration) a lower gear is immediately engaged. This is known as kick-down. If the accelerator is released from the kick-down position, the gearbox automatically changes up.
How many times does a TH400 shift?
I tested it at least 6-8 times and this is what I found. The trans. will shift from 1st-2nd under WOT between 4200 rpm and 4500 rpm’s. It seems to favor the lower end some. The 2nd-3rd shift under WOT happens between 4100 to 4300 rpm’s.
How do you check a kick-down switch?
The kick down switch at the gas pedal can be tested with a multimeter(set on ohms). The solenoid in the pan can be tested by applying 12 volts to the vertical connection at the transmission and listening for a click emanating from the pan. You need to ground the transmission when you do that.
Do all cars have a kickdown switch?
Do all Automatic Cars have Kickdown? Almost all automatic cars have the kickdown feature. Earlier automatics, or basic modern automatics simply have a switch that’s activated by the driver pressing the accelerator pedal to the floor.
How do you know if detent cable is bad?
Symptoms of a Bad or Failing Kickdown Cable
- The transmission shifts hard.
- The car shifts early and fast.
- The transmission shifts slow and late.
What RPM does a TH400 shift at?
The trans. will shift from 1st-2nd under WOT between 4200 rpm and 4500 rpm’s.
What is kickdown relay?
The only function of the kickdown relay is to ensure that the transmission shifts instantly and reliably at redline. The relay receives an RPM signal from the ECU at redline. The relay activates, opening the normally-closed contacts.