well I finally went out side and tore down my 10 bolt to find what pinion bearing went bad. and what to my surprise the bearings were fine so while inspecting the teeth for abnormal wear I noticed a crack in on of the valleys on the pinion so further cleaning I see that the pinion has this crack going from the valley to the center of the pinion(the shaft)on about 4 teeth. what happened? the bearing look great and the teeth were riding perfect. I have a fairly built 350 but, does it have that much torque? I noticed I had a problem because every time it would heat up I could hear a noise like a spun bearing but, I guess It was just the cracks allowing the pinion to change is shape slightly and ride different.

 

If they are new gears, they may have not been "broken in" properly. When new gears "break in", they wear, and create heat. If you don't do it in stages, you can overheat them, and they will loose there "temper".

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they are about 1-2 years old had the dealership rebuild my rearend while I was in school. they installed every thing new. all but one axle.

 

It was probably a bad gear. Overheating would tend to accelerate wear on the teeth surfaces, not cause cracks at the tooth root. Although gears are made from pretty hard steel, overheating would tend to deteriorate the case hardening. It's not uncommon for improper through-heat treating to cause cracks, though.

I'd say you have a warranty claim (latent defect).

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