Th400 kickdown switch

[Hamgrease]

Hey everyone, I have a 85 C10 that was originally a 6.2 diesel/700r4 truck. It now has a 454/400. I’ve installed the kickdown switch solenoid on the petal bracket and made my own harness, it works I’ve tested it. My question is are the accelerator petals different for the TH400 from other transmissions ? My petal doesn’t reach far enough to engage the switch. I’m considering fabricating and welding an adapter rod to it for engagement of the switch.

 

[idahovette]

It ain't a FLOWER......that's PEDAL.......Mike is gonna get ya @SquareRoot

 

[Rickf]

Flower power.

 

[DoubleDingo]

So what you're saying, the switch works fine, just that pedal, when mashed down to the floor, doesn't trigger the switch? Those are designed to kick down at full throttle and under 55. Well, mine won't kick down over 55.

 

[slammed84]

Hey everyone, I have a 85 C10 that was originally a 6.2 diesel/700r4 truck. It now has a 454/400. I’ve installed the kickdown switch solenoid on the petal bracket and made my own harness, it works I’ve tested it. My question is are the accelerator petals different for the TH400 from other transmissions ? My petal doesn’t reach far enough to engage the switch. I’m considering fabricating and welding an adapter rod to it for engagement of the switch.

I believe that factory TH400 cars and trucks did have an specific bracket that had provisions for the kickdown switch. I've looked into this because I also need to install the switch, but it's been awhile since I Googled it. You could try to research it, I'm fairly sure this was the case.

But I'm with you, I would just fab up a bracket that mounts it in the correct position you need, would probably be easier and cheaper than finding the correct pedal/bracket and whatever it takes to mount it correctly in a squarebody.

 

[DoubleDingo]

Check this out if you haven't already....

https://www.gmsquarebody.com/threads/th400-kickdown-switch-information.7242/

 

[Matt69olds]

If it’s close, slip a piece of rubber hose over the switch. You can also use a hose clamp on the switch knob.

McGuyverism!!

 

[Hamgrease]

Check this out if you haven't already....

https://www.gmsquarebody.com/threads/th400-kickdown-switch-information.7242/

I checked it out but it appears my issue is I may have the Throttle cable it doesn’t go back far enough to touch the kickdown switch unless it needs the actual throttle petal assembly for the th400 application that is designed to do so I’m probably just gonna fab something that works

 

[Hamgrease]

If it’s close, slip a piece of rubber hose over the switch. You can also use a hose clamp on the switch knob.

McGuyverism!!

 

[Hamgrease]

It’s way off

 

[DoubleDingo]

It’s way off

Pics of the setup would help

 

[Hamgrease]

Pics of the setup would help

I fixed it today it works perfectly

 

[Hamgrease]

Picture was before I reattached the throttle cable

 

[Hamgrease]

I believe that factory TH400 cars and trucks did have an specific bracket that had provisions for the kickdown switch. I've looked into this because I also need to install the switch, but it's been awhile since I Googled it. You could try to research it, I'm fairly sure this was the case.

But I'm with you, I would just fab up a bracket that mounts it in the correct position you need, would probably be easier and cheaper than finding the correct pedal/bracket and whatever it takes to mount it correctly in a squarebody.

The bracket for the switch was actually already on the truck I just had to find a bolt to install it I had one

 

[DoubleDingo]

I fixed it today it works perfectly

Glad you got it fixed and working properly. Having that kickdown with the secondaries roaring sure does get the ticker to tick faster...lol...