The T45RS is less expensive for a reason. It's not anywhere near the torque capacity of the TKO's. This is basically the same transmission installed on late 90's Mustangs. Please note if the Ford guys are replacing these with TKO's - the bet is you will be as well. Remember you get what you pay for, think long term and build your car accordingly even though it can take you years to get there.
Tony Edler
Hurst Driveline Conversions
formerly Classic Mopar 5 Speed