what hp can a 742 case 8 3/4 handle

489 case, 4:87 Richmond gears, spool,crush sleeve eliminator, set up perfect, with back brace.29.5 X11.5 Hoosiers 12 PSI,S/S springs.3300 # car, 451 BB 461 H.P.to rear wheels. Power Glide with brake.3 passes and broke on the line on the 4th.
The last 489 case I ran behind a SB with 5:38 gears, back brace etc.made 10 passes and the same thing happened.
I ran a 742 case in a back half Duster with 4:87's and 15 X 32 Hoosiers, leaving off a Grinner transbrake 727, they were fine for 3 years (300 passes), before the ring gear teeth starting chipping. They were not Pro Gears. Three of us got better life out of street gears believe it or not over the Pro Gears.
I am running a 742 case now, in the 451/power 'glide combo, have 30 passes thus far.

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