Lot's of people run them, most gears are 8620's only the pro series are 9310's. I've bougth about 1/2 doz. sets from Quick performance, now running in some 4 sec. dragsters and 6. sec door cars. They are a little more brittle than a pro gear. The stock pinion support would be my only suspect if it has a drag racing spool. Some of the circle guys use the light weight spools and they will deflect on a hard launch. Take a look at the radious on the spool on the inside and out side of the spool flange if it's a 3/16" rad. instead of a 3/8" or 1/2"rad it could be dangerous for deflection.
JMO
Zip.