When the truck warms up when driving the tranny seems to slip for a second then be fine then slip again about every mile or so after 2 or three times the check engine will come on but will clear when you start it the next time
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Are you using aftermarket additives like ptfe products? Some of those products come with a warning that it may cause gears to slip. How many miles are on your truck between transmissions? Since this isn't a common problem with Chevrolet, and this is the second time, it is hard to pinpoint. Have a transmission shop do a diagnostic.
Could be a long list of things. Its too late for a filter change. Doing that now would probably make matters worse. The trans uses electric solenoids and a pump to apply pressure to the clutches. So either could be faulty given the age and mileage. I'm not sure if the shifting problem is connected to the shift indicator lights problem. You may need to take it to a trans shop to find out for sure. And they will not want to touch it with that many miles on it. A regular mechanic might be able to do a pressure test on it to at least find out if it is the pump or not.
It isn't when the engine gets hot, it is when the transmission fluid gets hot that the slipping starts, due to wear of the clutches and gears inside the transmission. First, check the fluid level to make sure it is full. If it is low, bring fluid level to full and see if that helps.
About all the owner can do with slipping automatics is trying a transmission fluid and filter change to see if transmission revives and stops slipping. The bottom pan is removed, fluid (about 6-8 quarts) is drained, and a new filter is installed before the pan is replaced with a new gasket, sealed up, and fresh fluid added. Sometimes it helps. Sometimes the transmission is worn too bad to help, and you are left with looking for a replacement transmission. Check the fluid level first. Good luck.
Warm up engine until you see the temp indicator come up off the C mark about 1/8 inch. This should take about 5-8 minutes. Shut off engine and check transmission fluid level. Always check level with engine warmed up. After adding fluid, run it again for 5 minutes to warm up the fluid you just put in, and check it again. Do not over fill. Also examine color of your fluid. It should be red. If it is brown, or reddish brown, it's burnt. Drain fluid, remove pan, clean off magnet inside of pan. clean out sludge from pan. replace filter and gasket.replace pan, refill fuid, warm up and check level.