R&R trans tail housing in the car??

The back end of my tail housing (280-z 5 speed), where the driveshaft seal goes, is cracked and leaks gear oil. Is it possible to R&R the tailhousing with the trans in the car? I just put everything back in there after doing a engine-trans swap... I didn't notice the crack until it was all bolted up!! I really don't want to have to take things apart again!

Thanks