67-70 TH400 Kickdown Harness Firewall Hole Location
Does anyone have a photo that shows the stock location on the firewall where the TH400 kickdown harness passes through on a 67-70 truck?
My '68 has a TH400 that the PO installed, but he did not install a kickdown switch. I've purchased a 67-70 kickdown harness from GMCPauls, along with a B&M switch that I will mount to the TH350-style kickdown bracket currently on my engine. I will have to drill a hole in the firewall, and I'd like to put it in the stock location. I searched through many threads about TH400 kickdown switches, and the closest I came to a photo was in this post, although it was a bit vague. https://67-72chevytrucks.com/vboard/...firewall+th400 |
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My kickdown solenoid wires run down under the coil and to the trans . Dont see them going into the firewall but I could be missing them
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I'll look at it again tomorrow
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I believe 72c20customcamper is correct. Here are a couple pictures from my truck that may help. The first pic shows the original TH400 switch with the wiring coiled. The plug on the end attaches to the transmission. Are you confusing the plug with a grommet?
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1) Power connector with a pink wire that plugs into the fuse panel. It has a piggyback connector in case something else needs to be plugged into the same spot on the fuse panel. 2) Firewall grommet 3) Carburetor switch connectors 4) Transmission connector with rubber hood The power connector 1) is very close to the grommet 2), so I'm thinking the firewall hole has to be close to the fuse panel. The mystery pink wire in the link I included in my original post is right over by the fuse panel. |
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Here is where it goes through the firewall.
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GMCPauls site shows that the 67/68 harness is different from the 69/70 version. However, his pictures look the be the same. Neither resembles my "69 original.
EDIT: I believe some TH400s had a one prong connector on the transmission and others had two. I don't know when the change was made. |
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My 67 gets power from the wiper switch ( it has a jumper harness from the wiper terminals) and goes thru the firewall by the Throttle.
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Re: 67-70 TH400 Kickdown Harness Firewall Hole Location
Are you especially interested in drilling a hole? I didn't understand why Chevy didn't just push an extra Packard 56 terminal into the firewall connector. I've put extra wires through the firewall just by using empty slots in the firewall connector.
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The following thread shows the stock firewall hole location for the kickdown power wire in a 1968 with a TH400.
https://67-72chevytrucks.com/vboard/...d.php?t=825672 https://67-72chevytrucks.com/vboard/...1&d=1631196249 |
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Here are 2 poor photos of where the T400 kick down wire passes through the firewall on my 67 Burban. It is the yellow wire at the end of the arrow.
The PO converted the throttle from a rod to a later model cable hence the round plug above the kick down wire. Pay no attention to the PO's cobbled up mounting of the kick down switch. |
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Unfortunately the truck is back in the body shop and my memory has failed me on this. It may be next week before I can verify it for you.
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