Anyone know what this is called? It seems to be the source of my transmission leak. See below. I'd like to know what it's called and what to replace, just the o-ring or the entire module? 1995 Blazer LT 4x4.

For reference:


Where I believe mine is leaking, I have a puddle directly below this and losing a lot of fluid.

 

Its the main valve body harness that controls all the shift solenoids inside the trans. Not much you can do other than buy a replacement harness, drop the pan, and change it out.

Not a terribly difficult job, but you're better off actually REPLACING the harness if you go in to try and fix the leak, because from my experience those plugs get brittle and tampering with them causes them to fall apart... It IS just an O-ring that seals the plug to the trans there, but it would really suck to get the pan dropped and try to remove the plug to replace the O-ring only to have the plug fall apart in your hands and you be stuck with the truck torn apart...

 

Any ideas on the part numbers or exact names so I can find the parts? Thanks for the information...

 

Ok, think I found it. I take it these are known to leak? Anyone else have this problem?

https://shop.advanceautoparts.com/p/...ission+control

 

 

That looks like it! Just make sure you you select the correct year, 2wd or 4wd, etc, while you're ordering it, as I know there where some minor electrical changes with the 4L60E trans through the years.

A couple years back I lost first and final drive gear on my 04, scanner showed that one of the shift solenoids were not actuating. I ended up replacing ALL of the solenoids while I had to dig in there, the harness, and of course did a fluid and filter change at the same time (which I would recommend at the same time btw). It's not a hard job at all, just take your time, be methodical, be clean (don't let any dirt or anything get in there), and keep track of where everything goes as you pull it apart.

I've never touched the internals of a transmission before this little project ever before in my life. I was a little nervous, but I was confident in my mechanical abilities, so I figured that I would give it a shot. In the end, it was a breeze, only took about 30-45 minutes (granted I had a lift to put the truck on, that made it easier...), haven't had a single issue since the fix, and I'm sure I saved myself THOUSANDS, as a shop would have surely said "you need a new transmission"...

 

Thanks, that pic is very helpful. I've done dozens of tranny filter changes in my life, just never done a solenoid type thing like this. Got the parts tonight, taking this on over the weekend. I wish I had a lift, but jackstands and ramps should help get 'er done...

I know a shop would have been hundreds at the very least and it's a pretty simple leak, just a lot of pieces come into play to resolve it.

 

Ok, this was a lot of work on our 1995 Blazer. Other models may be different. Replacing Transmission Control Connector, TCC Harness.

1. Put a jack under the transfer case lifting plate and remove the transmission mount bolts, you will need to jack up the transmission during this project
2. Drop the 2 Cross member bolts on the passenger side, then pull 1 from the drivers side - Just DO IT, you're not getting the pan off between the exhaust and the crossmember if you don't and it still binds on the exhaust even when you do.
3. This job sucks.
4. You must remove the accumulator piston housing to remove the EPC Solenoid to remove the harness (on my 1995 you have to), nothing too scary here, just go slow and make sure everything stays together in the housing when you take it off and be careful you don't pull the gasket down as there is a check ball in there. My housing separated easily, no sticking to gasket so no issues.
5. You have to remove the shift solenoid to replace the lock up solenoid, you can't get the lockup solenoid out if you don't remove the shift solenoid
6. The 4 little plastic clips that hold the TCC harness connector into the transmission housing are a B*&$H to get out, no good angles, but take your time and you can get it.
7. This job sucks
8. If you take your time, and DO NOT rush your way through this, it's doable for a technical home garage guy. I was a mechanic over 25 years ago and went to tech school, but have not done this much work of this type in a long time. But it's doable if you have the tools and will to do it.
9. Other than the things I listed above, it's not much different than a fluid and filter replacement, just know that pan is a B*#$% and takes the most time to get it out
10. Took 5 fulls quarts of Dexron III when completed to refill

I didn't take any pictures because it was messy and I didn't feel like jacking with the camera, sorry...