Here is a discussion involving using a powerglide car 3.54 diff with 6 lug axles.
Another note, you may have to modify the length of your whole TT (Torque Tube) with this swap. I understand that "Mother Trucker" may have a ring and pinion set that you can install but I also read it's only for up to 53???
I always say this with the understanding it's not universally accepted. ....... Get rid of the torque tube and go open. Different trans required. It's really not that hard or expensive with donor parts from a running donor.
