What could be wrong with my transmission? on 1995 Cadillac Seville SLS

My caddy wont shift after 40-45mph and the rpms run high.

Asked by for the 1995 Cadillac Seville SLS
It may be time for an overhaul. Get it checked out at a transmission shop or a Caddy specialist.
If you want to find a specialist, here's our directory link for you: