I won an auction for a TH350 on e-bay. Well when the trans arrived it wasn't a 350 but a TH400. :roll: The 400 looks good and is the HD unit. It has HD 39 stamped on the top. To send it back and fight for the return of my money would be a waste of time. How hard is it going to be to put this 400 in my 81 Elky which has a 350 engine and trans in it now. I know the bolt pattern is the same for the bell-housing and converter. I know that I will need to find a donor car to get the electrical kickdown parts for the 400, shorten the drive shaft and change the yolk.I The biggest concern is can I move the the trans cross member back to accommodate the longer trans.