9 sec combo with 8.75...

I see quite a few members on here using 8.75 rear and running crazy fast times... I know my buddy Tory and Brett Miller are running similar combos to what I'm going to be running stroked W8/W9 motors. They are both running mid 9's with 1.2 and 1.3 60's.... I also saw a lot on moparts.com running 8.75 as well... Their are 3 guys on yellowbullet.com that are running 8.75 and leafs that are in the 8's...

So my question is I want to do a triangulated 4 link but don't have the coin for a Dana... I do however have a nice 8.75 742 case 4.10 gears. Why wouldn't this combo hold up like everyone else's? To me the pinion 742 case looks beefier vs the 489 case anyways. I figure I can get new billet caps and back brace is and be done.

What are your thoughts? Are all these guys just an exception?

Jason