Hey I broke mine too. But I got it fixed. From what I could see was that you pull the pump, big snap ring, and the shaft goes through the ring gear, small snap ring on the back end of the shaft. Of course you have to remove the Servo and VB...I'm not 100% on this. I was just watching Lonnie when he replaced mine. Literally took minutes to go through my entire tranny and check things out.
BTW: Mine broke due to locking the convertor all the time. IF you get a billet input shaft or turbine shaft like the manual calls it... you might as well spend the money on the billet OD ring gear and billet planet...all for about 800-900 bucks. Because it will just send the load right to the splines on the ring gear and so on. Then the trans will be good for high 9's assuming the calibration is correct with the VB. To make it live long. If i"m out of my tree please tell me. I'm just learining these trans I think I'll get a core and try to build one myself here soon.
-Jason