im having a problem with my 1-2 shift point....as far as i can remember its always been like this,so it hasnt just happened recently....

with WOT the car shifts from 1-2 at 3400rpm and at 20mph...all the other gears shift like they should,at the desired rpm,right at 4500rpm....and at the correct speed....

is there anything i can do to get the RPMs up to around 4500 for the 1-2 shift?

any ideas or suggestions welcome...thanks in advance
dave