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  #1  
Old 12-29-2010, 01:11 AM
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How To Change TCC Solenoid

First off, I know I'm starting a new thread on this. My other thread has pretty much died. I'm not really getting the help I expected to on these forums. I know people on here aren't transmission gurus, but I just have a pretty simple question about my tranny. Nothing to fancy. So a little insight on my problem would be very appreciated.

Anyways my truck threw a C.E.L and it was P1740 my TCC solenoid.
I have a 2001 F150 5.4L with the 4R70w transmission.

I ordered a new TCC solenoid for 20 bucks after I found out Ford wanted 50 for it.

I got this one: http://cobratransmission.com/index.p...ucts_id=109065

So here is my question. When I unbolt the transmission pan obviously the fluid is gonna come out. Then after that I can just pull the filter out right?

After I pull the filter out will the valve body be exposed?
This thing right? Click the image to open in full size.

I know that the TCC solenoid is right above the pink painted part.

I'm going to unscrew the bolt take the old one out and replace it. Then just put the filter back in and bolt it up and re fill right?

Should I get a new filter while I'm doing this as well?


Thanks everyone so much and I'm sorry for the repeated long posts.
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  #2  
Old 12-29-2010, 07:22 AM
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Yes you will just pop the filter out. This is a pic of the valve body [the other side of the one you have]

Click the image to open in full size.


Have you verified that you don't have a wiring issue?

Last edited by torkum; 12-29-2010 at 07:25 AM.
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  #3  
Old 12-29-2010, 11:51 AM
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Thanks for the reply Torkum.

Will I need to take the valve body out or will the side with the solenoid be exposed once I take the filter out?


Also how do I verify if its the solenoid or wiring?
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  #4  
Old 12-29-2010, 04:27 PM
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Exclamation

Change the wiring harness too.
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  #5  
Old 12-29-2010, 04:53 PM
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You won't have to take the valve body off, just the bolt and pull the solenoid off. Make sure the O-ring is on the stem of the new solenoid.

Replacing the wiring harness is a good idea too. Yours is a 2001 so it should be a solid plastic piece that runs from the main plug into the tranny to all the solenoids inside instead of wires. Not sure how much it is but you might as well change it while your in there.

Also, some people will tell you that replacing the filter isn't necessary, and although they're probably right as they only really get contaminated when things fail in the tranny, they're cheap and I would say why not.

- Erik
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  #6  
Old 12-29-2010, 11:11 PM
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Thanks for the replies everyone I really appreciate it. Could someone point me in the direction of a new wiring harness? Also could someone verify the solenoid I got is the right one?

Aa for the wiring harness is that just an unscrew and screw the new one in or what?

Thanks everyone so much. Sorry if there's spelling or grammar errors im posting from my phone.
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  #7  
Old 12-30-2010, 01:28 AM
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Yes, the TCC solenoid is the round one just above the pink paint. The two square ones that are together are the shift solenoids.

As for the wiring harness it will be a hard plastic wiring harness. Basically, one end will go through a hole to the outside of the transmission to connect to the truck wiring harness. The other end will be inside of the tranny, and it goes over the solenoids and snaps onto them. I don't think theres a bolt holding it in just a couple snaps but there might be a bolt I don't remember. Should be pretty straight forward to remove once you take a look at it.

I have bought my tranny parts from this site before. Here's a direct link to the internal wiring harnesses for the 4R70W:

https://www.wittrans.com/SchematicPa...E&LinkCode=446

It should be any of the ones that say hard wire; the soft ones are for the pre-99 trannies. Also, I think if I remember correctly, any of the ones on that site that the part numbers start with a "U" are used parts. So go for the top one on that list I think. Its number: 76446E

Edit: It should look like this one:

Click the image to open in full size.

- Erik

Last edited by scruffy; 12-30-2010 at 01:30 AM. Reason: Adding Picture
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  #8  
Old 12-30-2010, 01:48 AM
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Thanks for the help Scruffy!

So I just wanna get a run down before I start the project.

1. Unbolt the tranny pan and drain fluid.
2. Pull filter out.
3. Valve body will be exposed without having to take it out.
4. Unscrew TCC solenoid and screw new one in.
5. Unsnap/Unscrew old wiring harness to/from TCC solenoid and replace.
6. Replace filter.
7. Bolt tranny pan back on
8. Refill

And you said its all straight forward so there shouldn't be any surprises?
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  #9  
Old 12-30-2010, 01:56 AM
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One last question, and I think I am set.

The red circled part is that where the wiring harness is located?
Click the image to open in full size.
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  #10  
Old 12-30-2010, 09:06 AM
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Yes, that's essentially the process except for one thing. The harness also connects to the TCC solenoid. So you'll have to unsnap it from all the solenoids first, replace the TCC solenoid, and then install the new harness.

And yes, that's where the harness connects, but also if you look closely there is another square connector on the TCC solenoid and there will be a third pressure regulating solenoid that isn't shown in that picture that it unsnaps from. The harness goes completely across the valve body, connecting to all three solenoids and then out through a hole in the top of the tranny on the passenger side.

Also, I'm not sure how replacing the fuel filter is related lol... (nvm, post removed, I guess the guy was spamming...)

- Erik
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  #11  
Old 12-30-2010, 11:56 AM
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So essentially I will have to remove all the solenoids then replace the wiring harness and put all the solenoids back?

Thanks for your help. I will be tackling this project as soon as the parts come in.
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  #12  
Old 12-30-2010, 12:36 PM
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No, just remove the harness, and then the TCC solenoid, and reverse to reinstall. The solenoid's go on the valve body, then the harness goes over them.

Like I said, It should be pretty straight forward to you once you drop the pan and just take a look at it.

- Erik
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  #13  
Old 01-01-2011, 09:01 PM
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Exclamation

If you have a digital camera take pictures before you unbolt/unhook anything.
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  #14  
Old 01-03-2011, 11:00 PM
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Quote:
Originally Posted by BlueOvalFitter View Post
If you have a digital camera take pictures before you unbolt/unhook anything.
Yeah I'll be doing that. Thanks.

And scruffy big thanks for all the help
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  #15  
Old 01-04-2011, 05:09 PM
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Quote:
Originally Posted by |SoCal|Screw View Post
Yeah I'll be doing that. Thanks.

And scruffy big thanks for all the help
No Problem, Hope it goes well.

- Erik
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Old 01-04-2011, 05:09 PM


 
 
 
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