TH400 kick down solenoid questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**IT Cowboy** · 02-28-2026, 10:27 PM

I took my truck for a bit of a shake down cruise today since doing a few mods and adjustments. I didnt think think the trans kick down was working quite right so when I got home I put a volt meter on it. It was not coming on until the pedal was mashed hard and the carpet was keeping it from doing that. I adjusted the kickdown plunger that the throttle hits and made it kick in sooner.

I took it for a test drive and when I mash the throttle at around a lower RPM it kicks in ok and pulls decent. When going 30-40 and I stomp on it it pulls but it is gradual and pours it on steady. Is this how it is supposed to work? It wont throw me back in the seat or do burnouts. I take it that is just the nature of the three speed and it having more torque than giddy up.

When I am driving and I reach down and pull the plunger by the throttle manually then I can feel it drag down a bit

02-28-2026, 10:27 PM	#1
IT Cowboy Senior Member Join Date: Jan 2025 Location: Arizona in a van down by the river Posts: 617	TH400 kick down solenoid questions I took my truck for a bit of a shake down cruise today since doing a few mods and adjustments. I didnt think think the trans kick down was working quite right so when I got home I put a volt meter on it. It was not coming on until the pedal was mashed hard and the carpet was keeping it from doing that. I adjusted the kickdown plunger that the throttle hits and made it kick in sooner. I took it for a test drive and when I mash the throttle at around a lower RPM it kicks in ok and pulls decent. When going 30-40 and I stomp on it it pulls but it is gradual and pours it on steady. Is this how it is supposed to work? It wont throw me back in the seat or do burnouts. I take it that is just the nature of the three speed and it having more torque than giddy up. When I am driving and I reach down and pull the plunger by the throttle manually then I can feel it drag down a bit __________________ 1972 C10 Custom Deluxe Highlander 402 Freedom isn't safe, it requires you to take responsibility for your own life, your own safety, and your own success. It carries with it the possibility of failure and the understanding that you're working without out a safety net. If you give the state the responsibility for any of these you also give up the freedom that accompanies the responsibility.



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