I am new here so Id first like to say hello to all and God bless, hopefully I can be of some use to you all as well. Well here goes nothing. I own an ol 1991 chevy 3500 dually single cab dont know if it was the original engine or not as I am not the first owner but it currently has the 454 powered by the famous th400. I am in the process of plotting an overhaul installing the Lq9 the engine I am sure will fit without issue as the engine compartment is massive, my question is will the 4L80 fit or will I be up the creek in headache? Thanks in advance.