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 Post subject: street gears v pro gears
 Post Posted: Mon Jun 15, 2009 3:58 pm 
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i use street gears in my 9 inch and they typically last 18 month or so, the ones in at the moment have started to whine now.. my pile weighs 3800lbs and leaves of transbrake,, 60ft is 1.35 best.. i drive the car in the street a lot so dont think i can use pro gears..is this time period normal to use up the gears..


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 Post Posted: Mon Jun 15, 2009 7:29 pm 
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not normal at all to use gears like that

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 Post Posted: Mon Jun 15, 2009 10:45 pm 
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As quick and heavy as that thing is, it's going to be hard on anything you put in it! I've heard it said that synthetic gear oil will help with shock loading but don't have any actual data to back that up.

I've broken several 9 inchers even before I destroyed that one last fall with the reverse thingie at the stripe. One was a street gear and the other was a pro gear and both were broken in light weight cars, ie, digger broke the street gear and the Camaro broke the pro gear. Both times I was running the same pump gas "junk" engine.

My 3500lb Studebaker has a Dana 60 under it and I broke one of those in 9 years of racing and street driving. But I do hate fooling with that thing though. It's a pure bitch to set gears up in!

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 Post Posted: Mon Jun 15, 2009 11:52 pm 
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If you're not using synthetic you should be. It's the street driving that will generate the heat that will destroy a gear. I think richmond requires synthetic in their gears for anything lower than a 3.73. If you're going to street drive it leave a little extra backlash in it. As the gear gets hot it expands and you will lose some clearance and if you have it at the minimum there won't be any space for lube. These are things that don't come into play at the dragstrip because it's not driven long enough to build that kind of temp.

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 Post Posted: Thu Jun 18, 2009 5:15 am 
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I've heard that street gears will last much longer than pro gears. That is they wear out less. I've talked to different manufacturers about changing the gears in my altered and some say street will be fine and some say I have to run pro. Not even the "experts" can agree on which is best.

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 Post Posted: Thu Jun 18, 2009 10:54 am 
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Pro gears are softer to help eliminate shock load breakage. The down side is that they will wear out faster. I'm not sure but one would think maybe synthetic lube could help with that part in a street driven application. I also agree with gearhead on the additional backlash for street driving. I'd put another .003 or so in it to allow for heat expansion. If memory serves, I think Richmond does/did recommend additional clearance for round track applications, which I would say was related to the heat expansion issue.

On another note, if you can afford to pay $7+ a gallon for gas to drive that thing enough to wear out a gear set, then I think I'd try a pro set with synthetic oil to see how it worked out. ;-)

If you do decide to try a pro gear, I'd be interested to hear how they hold up for ya.

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 Post Posted: Thu Jun 18, 2009 10:35 pm 
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'32 Bantam wrote:
I've heard that street gears will last much longer than pro gears. That is they wear out less. I've talked to different manufacturers about changing the gears in my altered and some say street will be fine and some say I have to run pro. Not even the "experts" can agree on which is best.



When I called to order new gears for my dragster was told to get the street gears because they will last longer, this was chassis shops, sales shops and the people making the gears. Most people I know run the street gear after breaking the pro gears :-$

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