4L80 in my truck is acting up a lot
 

2000 Silverado 2500 4wd 6.0 4L80, RCLB.

First off the TCC locks up randomly. Normally it'll just stumble at a light and recover but it actually stalled yesterday. The TCC is on the valve body and I have to drop the pan again soon and replace the gasket. I just did a service with Dex6 about a month ago and the pan is leaking which I top off and check regularly. It only took 4 quarts instead of the 7.7 I was reading. Maybe it was already overfilled when I bought it? Was warmed up when I checked it.

Second... Random hard shifting and overall erratic shifting. Sometimes it feels like it takes off in second and the truck just feels like a slug most of the time. I've read about the shift solenoids needing to be replaced and those are also on the valve body..

Seems like the common denominator is that everything on the valve body seems to be acting up. I know a little bit about autos but I don't have good luck with GM autos. They never last long and always act up with me.

Anyway. Time for a rebuild or is this salvageable? This truck is turning into a money pit. Unless someone locally can rebuild it for a reasonable cost. Or I can put it up for a trade on CL.

dirty valve body. pwm solenoid especially. get rebuilt one. or have trans shop go threw it for you in dunk tank etc. using brake clean after you disassemble it works Maybe 30% of the time.

^ Yeah I wouldn't imagine spraying the outside would do much.

I did the pan gasket today. I really had to. I couldn't put this off anymore. It was hemorrhaging oil. About 1.5 qts a day. I just didn't have time to deal with this till late next week. I'm moving into the house and I just can't have this right now. Still have to paint and get everything ready and I have a schedule to keep with the g/f and her folks helping us and her son is out for the week camping with his father so that helps not having him under foot. Just not a good time for this truck to act up. And I don't need it leaving massive oil puddles in the nice driveway. And it would leak on the exhaust when I stopped so I'm sitting in traffic and it looks like my truck is about to catch on fire.. :sFun_rofl:

But I took this morning to do the pan gasket in my driveway. Took my time with it and did the engine oil cooler line gasket as well. That was making a mess too and didn't come with the oil pan gasket. Did a GM gasket for both. It seemed to take better to it this time. It took all afternoon of driving to get the oil level to stabilize. Took 7 quarts this time. Sat in the driveway nursing it for a while at the end. Hopefully a lot of these drivability problems will go away from maintaining the proper oil level. HOPEFULLY. But the converter was still acting up on the way home. it's still pretty random.

Seemed to still shift a little odd. But at least taking the valve body down isn't that hard. Just have to pay attention.

It's hard when you have 12 ball bearings fall out and go "shit were do all these go?"

oh yeah.. lol.. at least with an older shift kit if you drop them you have a "map" of where they need to go. Do they still use those?

Smokey burnouts don't help either.

they do in the gm service manual. i have a hard time finding them else were. alldata is a joke usually and identifix is not much better.

dis.

wow.. I haven't used AllData since HS auto and auto tech school in 99.

I have the factory service manual for my Civic as a .pdf. It can be tricky to search but the information in there is very good.