Hey guys recently had heap of work done to my n/a xr6 which now produces 246rwkw.

My problems are
Auto will not change between first 1st and 2nd under full throttle as it flares above 6500rpm and sends it into limp home mode even when u shift at 4000rpm.
Need atleast a 3500 to 3800rpm. No one makes a stall for n/a 6 box
With the power and extra torque the box will eventurally slip and play up

ANyhow anyone have and ideas what could be done to fix problem or solutions

Cheers
Trav