got a used tranny and its been a pain in my a$$ ever since i got it. its a 4l80e 4x4 and recently i can be doing 50 down the road and after 15 ish miles the torque converter will unlock for no reason and just stays that way. once that happens shifting becomes rougher, but if i pull the truck over and shut it off for like 10 seconds and restart it and take off everything works fine... kinda stumped anyone have anyideas what could be wrong??
i bought a brand new converter from monster transmissions when i put the tranny in 1000 miles ago, 1400 to 1600 stall. running dextron 3 fluid and tranny cooler