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Old 08-20-2008, 09:33 PM   #11
KingReptile
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Default Re: Pro gear users please step in

Quote:
Originally Posted by Chris Hill View Post
Just curious, but what is the metrology and surface treatment difference between a "street" and a "pro" gear. I know the gear guys for over the road transmissions really like a 8620 gear with a carburized surface. Gives the "tootsie roll" effect. Hard on the outside with soft gooey center .

The pro gears are 9310 the heat treat should be pretty close to the same with 8620, carburized with probally .060 case depth.The 9310 Pro Gears will be tempered at a higher temperature to take away the brittleness .The higher the temper the softer the gear, Pro Gear i would think would be 55rc to 57rc where a street gear will be 61-63Rc .The 9310 will have a tougher core harness then the 8620 which should help with rolling over the teeth..Hope this helps
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Old 08-20-2008, 09:39 PM   #12
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Default Re: Pro gear users please step in

40 Coupe that black surface you blasted off that gear was a phospate coating which helps with initial break in .
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Old 08-20-2008, 10:16 PM   #13
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Default Re: Pro gear users please step in

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Originally Posted by KingReptile View Post
40 Coupe that black surface you blasted off that gear was a phospate coating which helps with initial break in .

Interesting.

http://classracer.com/classforum/sho...highlight=prep
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