th-400 kickdown...

[broncoman6524]

ok ive always thought taht a th400 used vacuum to operate kickdown...apparently its an electric swith. Correct? And the place to plug the wiring is on the pass side of the tranny behind the dipstick (towards t-case) and its just 1prong sticking out?

How do i wire up/rig something to make the tranny kickdown when the i mash the skinny pedal? If it matters its an 84 k5 350 and it WAS a 700 till it died

 

[bronc3buster842001]

the trucks that had the 400 orignaly had a switch the mounted to the gas pedal bracket . so just find a truck that had a 400 in it a get the switch

 

[HarryH3]

The switch goes on the bracket that holds the gas pedal. One wire goes to a fused "Hot in run" power feed in the fuse panel. The other wire goes to the connector on the side of the trans.

I got my switch from an old Jeep Wagoneer. The full size ones. They came with Turbo 400's in the early 70's.

 

[broncoman6524]

ok, can i get this from like any vehicle that had a th400? i mean like malibus, chevelles, w.e. i find? lol and will a th350 one work too?

 

[dremu]

ok, can i get this from like any vehicle that had a th400? i mean like malibus, chevelles, w.e. i find? lol and will a th350 one work too?

Well, 350's have a mechanical kickdown via cable.

A switch is a switch is a switch; all you gotta do is run 12V to that terminal on the side of the tranny, and it'll engage the solenoid and do its thing.

Warning: It will REALLY kick down

There are LOTS of TH400 equipped pickups out there in the junkyards, though.

-- A

 

[k30bb468]

Has to be from a T400 ,T350 uses a cable.
Here's a few pics of the stuff you need to look for.
Kick down switch

harness from tranny to firewall

harness from switch to fuse panel & to firewall

 

[broncoman6524]

hey boss man? care to put those into just htmls not attachments? lol. and thanks guys!

 

[6.2puller]

I believe you will find it to be on the drivers side of the tranny not the passanger side. Almost across from the vacume module.

 

[broncoman6524]

gotcha...does it matter if the switch is on hte gas pedal or on the carb linkage? i was lookin on google and chevelles had then on the linkages and opend up when stomped. Or should i just stick to a truck/van/burb/k5 style kickdown...thanks

 

[6.2puller]

Just an on off switch, should not matter where it is located as long as it functions as the throtle moves.

 

[broncoman6524]

10-4 im gonna try and go to the yards tue bc i htink theyre closed on mon. lol ill hopefully get what i need so i can get htis **** workin. lol

 

[3 on the tree]

Just mount a push type starter button on the floor, under the gas pedal.