Richmond pro gear life?

[Strick]

Thanks for the responses. Bill, I am in York, PA also.
Rory, It's a Ford 9" I'm asking because I only got about 50 runs from a standard Richmond gear-set before breaking of some teeth. This is my first set of PRO gears and was not sure what to expect.
The car runs 10.51 @ 127mph with 1.47 60'
500hp. 350ci. Jerico DR-4(broken)
Thanks again,

[Dave Goob Cook]

8620 sets, or "street gears", will break easily from shock loading, especially if you use the recommended backlash setting, they last longer with near zero backlash.....
9310 gears are "softer", they bend before they break off.
Usually you'll start getting noises when the teeth start laying over.

[LNorton]

I would have the cover off at 150 passes to inspect them.

[Jeff Lee]

Originally Posted by Strick

Thanks for the responses. Bill, I am in York, PA also.
Rory, It's a Ford 9" I'm asking because I only got about 50 runs from a standard Richmond gear-set before breaking of some teeth. This is my first set of PRO gears and was not sure what to expect.
The car runs 10.51 @ 127mph with 1.47 60'
500hp. 350ci. Jerico DR-4(broken)
Thanks again,

Sounds like too much clutch to me!
I run a Dana 60. I once placed a set of used pro-gear 4.88's in it from a 426 Max-Wedge 4-speed record holding A/S car. Those gears had over 500 runs on them. I added another few hundred before changing to a different ratio. Still look perfect!