So if you frequent here, you probably remember my post a while back about having a lack of torque/low end power. Well I may have narrowed it down a bit but now have another issue.
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 and I also have not had a check engine light come on since clearing all codes my scan tool did pick up. But anyways his tool found it. So I thought ok most common cause of that is tcc solenoid. So I went ahead and dropped the pan and replaced that as well as both A and B shift solenoids while I was in there. Now it needs noted, that beforehand I had no driveability issues other than my lack of low end torque. After replacing the 3 solenoids reinstalling the pan and filling it back up with ATF. I test drove it, this is where the problem began. Now I have no overdrive it shifts 1-3 smooth and with no problems and the torque converter will even go into lockup in third gear(from what I understand the 4L80E has 4 gears but it has 1st, 2nd, 3rd, 3rd lockup, 4th, and 4th lockup. I tested and varified 3rd lockup was working with one foot on the gas and tapping the brake with the other and my RPMs jump up showing me it's coming out of 3rd lockup) but it will not shift up into 4th at all. Now I don't really understand how installation of new parts could make a problem worse.
I went ahead and got a new torque converter for it as well just in case the solenoid didn't fix my issue (which it didn't) but I just wanted to see what everyone else's thoughts were before I pull the transmission and put a new converter in it. Although I will say I'm fairly certain I do have an issue with the converter. If the solenoid didn't fix my problem that leads me to believe the problem lies within the torque converter clutches themselves, that, and 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.
Any help as always is appreciated