The 8 3/4 rear end has no removable rear dome to access the gears inside. The 8 1/4 would have a bolt-on removable rear dome. I'll let someone else answer the trans question. Paul In a message dated 10/4/06 3:35:50 PM Pacific Daylight Time, moweepea@xxxxxxxxxxx writes: I know to some of you these might seem like simple questions, but I will never know if I don't ask. How do you tell a big block 727 from a small block 727. The other question is how can you tell the difference between a 8 3/4 and 8 1/4 rear end? Thanks, Harry [Non-text portions of this message have been removed] ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! '62 to '65 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html. This email was sent to: arc.6265@xxxxxxxxxxxxxx bSONJP. Or send an email to: 1962to1965mopars-unsubscribe@