okay so I had my 4l60e rebuilt, had it installed on my untuned cammed 6.0 that I recently swapped. I got the trans in and drove it 35 miles home. it did fine shifted good and all. Only problem was the line came off the cooler where the e clip snaps in. fixed it filled with fluid again and drove a good bit more. nothing else happened. I went the next morning to have the truck tuned for the cam and the line blew off in a different place so I just slid it back on and double clamped it. filled with tranny fluid again and made it to the shop. he street tuned it and did fine. drove ten miles on tune and go to stop at a redlight and truck acts like its in neutral and revinng kind of high still. and when I do get stopped it shifts hard back into drive. so I stop check the fluid and it was full. I added a little bit and kept driving. when I got about 30 mmore miles I stopped at another redlight and the same thing happened when I took off in drive it shifted to second and then the engine just revved. so I pulled into gas station to check fluid again it was full. so I filled it 1 1/2 quarts over because I called several people and they said it wont hurt it. so the I put it in drive and it pulls itself about 100 feet when it quit pulling again. stopped and shut it off. made sure all connections were tight under truck and they were. crunk it back up had no forward gears but had reverse. then I manually shifted into first and it went in drove it I shifted to second went smooth, then hit 3rd went smooth again pulled it into drive and it hit 4th and the converter locked like its supposed too. stop at a redlight and I shifted back to 1st and continued again with no issues. then I tried drive again and it shifted into second and it quit pulling again. pulled it into d2 and it shishiifted into there no issues. made it home just fine. can anyone helhttps://ls1tech.com/forums/images/smilies/LS1Tech/gr_confused.gifp me out? is it tune related or what? it was fine before the tune

 

This has absolutely nothing to do with your tune. You have already made it clear that your transmission was "rebuilt" and installed by people who aren't even qualified to hook up a fluid line properly. I'm sure you don't want to hear this, but you need a good rebuild and install. Once that is done you can find out if the tune is any good.

 

also it had bw sprags In it. mabey it was defective.