The bolt pattern spacing is different between the small & big block A-727 trannys. Looking at the trans case, the measurement between the top two bolt holes, at 11 o'clock and 1 o'clock position, measures 7 3/4" for the small block & 6 7/16" for the big-block A-727. The 8.25 has an inspection cover bolted on with, I think, 10 bolts, while the 8.75 does not have an inspection cover. Thanks, Gary H. harry skalla wrote: > 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@