Are you going in from underneath or dropping it all in at once? If going in from underneath, just disconnect your air intake from the throttle body and put a small jack under the front of the oil pan and jack up the front of the motor till the rear of the motor just kisses the firewall. At this point the trans should be going in at a pretty good angle and you should have plenty of room. I just put a 3650 in this way and the 3650 is a little bigger than the T-45 and it went right in.
2000 Mustang GT Steeda #0048
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.