ok wot shifting into 2nd it bounces off the rev limiter ? for a couple seconds than shifts.it did this before the rebuild didnt do it for about 3,000 miles
now it does most of the time not always though it has new band transgo shift reprogrammer kit it does have the servo pin shimmed anyone knot wtf is wrong?

 

You need to do some adjusting to your shift points mph and rpm parameters because of the gears and stall. It will take a bit of time and logging the info then figuring out where to set them, but it's pretty easy. I use HP Tuners.