4L-XRT

hey all, I just got my XR6T and have been loving it to bits! but I have recently found that its making a rather odd sound when changing from 1st gear to 2nd but only under boost it seems....when in first and I give it a bit and around 4.5k-5k I change gear it makes the does sound along with a little screeching sound...what could that be?

BA 4 speed auto 2004

Okay thanks guys...Elite Auto was where I went...ill stick with them in that case.

So I just got my very first XR6 Turbo and am very exited to have finally entered the world of turbo powered cars...im more than stoked with the stoke power of the Falcon but...I just want that bit more...I had a look at my local Dyno tunner shop and he said for a basic remap and dyno run and new valve springs it would set me back around 2,400 bucks! is that a normal price for such a thing or should I shop around more? also if anyone could recommend any places in the Brisbane or Gold Coast area that they have found to be particularly good please leave me an address so I can go check them out. thanks Guys and Girls!