tom the 4l80 is computer control for shifting i dont know how much hp u r planin on puttin out but for a 100 bucks i wouldnt go with the 4l80e. if im not mistaken the 4l80e didnt come out in 92 maybe its the 4l60e which is a 700r4. i run a bowtie overdrives 700r4 in my monte which can handle 450hp they do make one with will handle 600hp. i dont believe ur 400 converter will work with either the 700r4 or the 4l80e. u also might want to think about a less of a stall for street use, and i would change the converter so u dont mess up the new trans.