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08-19-2008, 04:15 PM
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#1 |
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VIP Member
Join Date: Jul 2002
Location: Michigan
Posts: 1,229
Likes: 133
Liked 535 Times in 110 Posts
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Re: Pro gear users please step in
No disrespect intended Mike, but there are applications that do require a "pro" gear, particularly those that are high HP or heavy. I used to run a "street" gear in my '70 Olds (3770 lbs.) that has a 12-bolt, but changed to a "pro" gear after a couple of failures and recommendations from Mark Williams. Naturally, a "pro" gear doesn't have the service life of a "street" gear, but it sure beats being towed off the track. Sure, a "pro" gear is more expensive, but most of the time when a gear set fails, it takes the transmission right along with it. P.S. - Mine also has a very slight noise on coast that you can hear when the motor is shut off.
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Jim Kaekel 3836 STK |
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08-19-2008, 05:02 PM
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#2 |
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Senior Member
Join Date: Sep 2007
Location: Henderson, NV
Posts: 583
Likes: 8
Liked 54 Times in 27 Posts
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Re: Pro gear users please step in
If you want to go "in between", Quick Performance got some 9" pro gears made up with "street" i.e. harder heat treat so they last longer.
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08-19-2008, 09:00 PM
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#3 |
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Junior Member
Join Date: Mar 2007
Posts: 91
Likes: 0
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Re: Pro gear users please step in
Thanks to all who responded. Jim- I'm where you are. I certainly prefer to have a bit of insurance with the pro gear.
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'67 Camaro 1.25 5.77 @ 118 |
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08-19-2008, 09:42 PM
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#4 |
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Senior Member
Join Date: Jan 2002
Posts: 655
Likes: 8
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Re: Pro gear users please step in
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
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08-20-2008, 09:33 PM
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#5 | |
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Member
Join Date: Mar 2008
Posts: 257
Likes: 0
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Re: Pro gear users please step in
Quote:
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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