I installed a transmission after my old one went out and added a 3k stall TC, and a transgo HD-2 shift kit. I also had Nelson tune for them both.

When the truck makes the 2-3 shift, the rpms rise about 300 before shifting to the next gear.

Is this normal, and if not, how can I fix it?

 

Sounds like you may have made a mistake in the transgo install and whats happening is the band is releasing to early o the 3-4 clutch is delayed engaging , Exactly what is is will likley only be able to be determined by going back through the transgo installation step by step

 

The problem he is describing is called a FLARE at the shift is it not?

peace
Hog

 

mines doing the exact same thing but its still the stock tranny and has never been worked on or modified that I know of. Could there be other causes? It seemed to start when i put my intake on like there might be a vacuum leak but for the life of me i cant find one.