what year car? if it has the 3650 there is no way that can happen unles the tranny its self broke. the tremec has internal bumpstops and eliminate all chance of this.
if you are the earlier T45 then it is possible to overthrow it.... however, you mentioned a tri ax handle... so i assume you have the whole shifter. that being the case the shifter has stop bolts that keep it from going too far. when i had the triax there was a solid 2 inches from the handle to the dash... and now that i have my comfort pro handle its just nowhere near.
as stated earlier, you do have the handle setup so that it is closer to you, correct? and at the lower position? you may want to uninstall the shifter, check out everything, then reinstall to make sure something it not blatently evident of a problem. I just dont see it as being possible, at least on a 2001.5+ with a triax...
Torinalth