Quote Originally Posted by lionelhutz View Post
Can you give some background, where the tune came from and what you changed before test driving? Is it possible your speed is off or you adjusted for the tire and rear-end but didn't scale the shift curves?
The initial tune was not done by me. Also, I don’t know the history of the transmission as we bought it used along with the engine. I did have someone else more knowledgeable than look at the initial tune and give me their opinion. They said the speedometer scaler looked good for my ratio and tire size so that was not changed by me. The one thing they questioned was the line pressure. Since I wanted a mild starting point I lowered the max line pressure and also made changes to the main line pressure tables. I used numbers from a bin that was recommended here at this site in another thread.