The front O2 sensor.

Do you now off hand what transmission you have?

I think it'* a 4T65-E

Have you checked your fluid level yet?

Actually topped it off with vavoline dexron III trans fluid

When it does this are you pulling away under load? Then it kind of hangs in a gear at high RPM and then finally shift? A bad throttle position sensor can cause this. Or does it seem to slip as it shifts? For that you may want to have teh trans oil pressure tested.

It hangs in a gear at a high rpm then finally shifts but like most times for it to shift i have to slow down then it shifts into the next gear.

Hang on a second, did you say this is a new transmission? Because what your saying sounds to me like the gearing is wrong between the transmission and the tune. An example is if your old transmission has 2.93 gears, and the new transmission has 3.29 gears that will throw off the shifts.

Yep it'* a new transmission well when i purchased it the seller told me it was a new trans put in there. So i asked for the paperwork to make sure it was legit and looked and everything checked out.

What your describing sounds like the gearing is wrong. I would have that checked. It'* a simple change to the tune to make it work right.

So should i take it to aamco it'* one down the street for me could they test it and do this? How much money will i be looking to dish out?