Case differance's

the above pics are of the 8.75 i scored for $250 bucks along with the 741 empty case and the loaded 742 case, was kind of disappointed after i got the axle opened up to find a 2.76 open diff in the 489 carrier, but never the less, i still feel i got a good deal.
Can anyone tell me if this 742 has a cone type or clutch type sure grip in it?

Thanks
Demon Scamp