Thread: 4L80E problems
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Old 01-18-2017, 03:52 AM   #5
Schurkey
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Re: 4L80E problems

Quote:
Originally Posted by hunter4ever12 View Post
I hooked my 94 K2500 up to my buddies high dollar Matco scan tool and found a code stores that said torque converter clutch stuck off. I have a scan tool myself but not as in depth as his Matco one. My scan tool never picked up this code
Drop-kick your "scan tool" into the trash can. It's worse than not having one at all. If a scan tool can't read transmission, air bag, ABS, etc, it's worse than worthless since it's giving you a false sense that there are no codes stored.

Is your "scan tool" an actual scan tool, or is it some consumer-crap "code reader"? A "code reader" is not a scan tool.


Quote:
Originally Posted by hunter4ever12 View Post
So I went ahead and dropped the pan... ...reinstalling the pan and filling it back up with ATF.
How many quarts did it take?

Quote:
Originally Posted by hunter4ever12 View Post
that leads me to believe the problem lies within the torque converter clutches themselves
The torque converter clutch (TCC) works now...right? So the converter clutch is probably JUST FINE. The poor low-speed power may have been a failed sprag in the torque converter, not the clutch.

Well, OK, the sprag is a one-way clutch, but that's nothing like the TCC. You'll want to be clear about WHAT in the converter may have failed, or you're going to confuse people.

Quote:
Originally Posted by hunter4ever12 View Post
after installing the solenoids and putting brand new fluid in it and driving it maybe 20 miles the brand new fluid already smells burnt and isn't bright red as you would expect it to be. It doesn't look full on burnt but it does have a brown tint to it.
If you didn't install 12 quarts of fluid--or more, along with a trans cooler flush--the new fluid has been contaminated by all the old fluid you didn't remove. Of course it looks burnt like the old fluid--it's about 1/2 new, 1/2 old.

Quote:
Originally Posted by hunter4ever12 View Post
it's extremely rare to find a part "bad" from the box.
Not like you'd expect or hope for. The Communist Chinese can screw-up ANYTHING; and sometimes even domestic product isn't QA'd like it should be.

Quote:
Originally Posted by hunter4ever12 View Post
Any ideas on how to troubleshoot why it's not shifting into 4th? That's more of what I was getting at. I tried to find a procedure list online
Time to buy a REAL service manual for that truck.
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