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02-12-2025, 01:39 PM
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#1 |
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Active Member
 
Join Date: Jan 2025
Location: Clarkdale, Arizona in a van down by the river
Posts: 191
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Can the TH400 solenoid be replaced without removing the pan?
I think the single wire solenoid on my trans is weeping a bit or is the source of a lot of the oil residue on the bottom of the pan and can that be replaced without removing the pan? I was hoping it is a matter of popping the old one out and shoving a new one in with an o-ring or gasket? I did put some dye in my trans fluid to try to verify the leak.
__________________
'72 C10 / 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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02-12-2025, 01:51 PM
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#2 |
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Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,697
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Re: Can the TH400 solenoid be replaced without removing the pan?
Sorry no, it pushes from the inside out
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02-12-2025, 02:02 PM
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#3 | |
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Active Member
Join Date: Jan 2025
Location: Clarkdale, Arizona in a van down by the river
Posts: 191
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Re: Can the TH400 solenoid be replaced without removing the pan?
Quote:
__________________
'72 C10 / 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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02-16-2025, 09:44 AM
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#4 |
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Moderator
 
Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,207
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Re: Can the TH400 solenoid be replaced without removing the pan?
The pan needs to be removed and the filter. The solenoid pushes thru the case from the inside to the outside. Make sure the O ring has some trans oil on it to stop it tearing.
The usual leak from these is the selector shaft seal...it can be changed from the outside if you are careful....I usually place a suitable sized O ring on the shaft beofre refitting the new seal..... Have fun Bill
__________________
Family and country before all others... 2006 Chevy Silverado (Daily Driver) 2012 Chevy Equinox 
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02-16-2025, 10:50 AM
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#5 | |
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Active Member
Join Date: Jan 2025
Location: Clarkdale, Arizona in a van down by the river
Posts: 191
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Re: Can the TH400 solenoid be replaced without removing the pan?
Quote:
__________________
'72 C10 / 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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