Re:727 a or b....rears 8 1/4 and 8 3/4

[rll <rlipinski3@xxxxxxx>]

From: Gary H. <62to65mopar@xxxxxxxxxxx>
Subject: RE: 727



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]

The ironic thing about small block bell housings is that 4-speed small 
blocks have a bolt hole at the very
top (12 o'clock)...because the 11 and 1 or 10 and 2 holes are so far part.

I cleverly posted this fact to the MML and was shredded to 
bids.....close together BB not so close small block.

the flat portion of the case is another good hint.

for the rear.....

if your car has bolts to hold the gearset into the housing on the 
u-joint side of the axle , you have an 8 3/4
or a ford 9 inch...there where a few older variations in the 50s but if 
you're not talking 50s then the statement
will most likely stand.

rob in phx


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