RPT OF TCASII RA EVASIVE ACTION MANEUVER TO AVOID CONVERGING ACR TFC WHILE ON SID CLB AT APPROX 1700 FT.

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WE DEPARTED RWY 33R ON THE TORONTO 3 DEP. AT 1100 FT MSL WE TURNED TO HDG 320 DEGS. IMMEDIATELY AFTER REACHING THE 320 DEG HDG; WE EXPERIENCED A TA ALERT FOLLOWED IMMEDIATELY BY AN RA. THE RA DEPICTIONS AND COMMANDS CALLED FOR IMMEDIATE EVASIVE ACTION. THE RA DEPICTION ON THE 5 MI RANGE SHOWED AN IMMEDIATE IMPACT PENDING; WITH A COUNTDOWN OF 500 FT; 400 FT; AND POSSIBLY 300 FT AND 200 FT TO NEAREST POINT OF CLOSURE. THERE WAS NO NOTICEABLE MOVEMENT OF TARGET THREAT -- IT APPEARED TO STAY DEAD CTR. AS THE CAPT WATCHED THE COUNTDOWN THE FO'S VSI DEPICTED THE GREEN ESCAPE AT THE BOTTOM OF THE VSI. WE COMPLIED WITH THE ESCAPE PROC AND RETURNED TO YYZ. RPTED AN RA TO ATC AT THE SAME TIME. AT THE GATE ALL PAX ASSURED THE CREW AND PARAMEDICS THAT THEY WERE PHYSICALLY OK; AND THAT THEY WERE WEARING THEIR SAFETY BELTS. AFTER DEPLANING; WE WENT INTO OPS AND CALLED THE CHIEF PLT. AS A CREW WE THOUGHT WE WERE DEAD. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT THEIR EVASIVE ACTION WAS EXTREMELY AGGRESSIVE WITH PITCH DOWN ATTITUDE AND COMMENTED THAT EVERYTHING WENT TO THE CEILING. RPTR BELIEVES THE OTHER ACFT WAS AN ACR BUT THEY DID NOT VISUALLY SEE THE ACFT AS THEY WERE IMC. RPTR ALLEGES THE DEP CTLR SAID THERE WAS NO TFC IN THE AREA. ANALYST LEARNED THAT NO FOLLOW-UP ACTION/CALL WAS MADE TO THE FACILITY REGARDING THE INCIDENT. RPTR STATED THAT THEIR ACFT WAS A CARJ.