The 'Burban Chronicles.....

[Average Joe]

Originally Posted by LockDoc

I can just about bet the 3.07's will be to high. It may be fine until it shifts into OD and the lockup kicks in. My experience was that when that happened the transmission would overheat and blow fluid out of the front seal. If I drove it locked in 3rd it was fine. Mine was a 4l60e but I'm pretty sure the results would be the same. Maybe the 4l80 would take more heat. I installed a 3.73 (because I had one) and it worked great and gets right around 20mpg. Engine is LS1 5.7. The 3.42 may work fine though.

Good luck whatever you decide to do.

Thanks for the input Leon. Any idea on why it was getting hot? Was it not returning fluid fast enough through the cooler? Slipping? Were you able to adjust when it shifted into OD or when the converter locked up? I may have to research controllers a bit more. Some of them have more adjustability than others.