XFR/Firecat/Sabercat Regular 128" XF / Firecat/Sabercat chassis

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Old 02-19-2011, 12:40 PM   #1
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Gear changing on a dd f7

Hey guys,
wondering if anyone has changed there gear ratio on there 06 f7 efi to 60/60 or 62/58 any likes or dislikes. I've heard before that some people think the stock gears 65/55 is a little to tall for the 06 f7. So i would like to change my ratio to see if it would pull better and shift out better also. 60/60 might be a little to low but willing to try since i have a extra dd with 60/60 in it. I just put 10 tooth drivers in my wife's 06 cf 600 and that thing rocks now, but it also stays right with my 06 f7 now. The f7 should be able to pull away with the extra hp. Thanks for any info guys:ta
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Old 02-19-2011, 02:39 PM   #2
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I never did the change, but did a ton of research and wish I had of....the best gear choice I would say is 63/57. It gives alot better bottom end and mid range and will still pull 110mph on top. I spoke to a few guys with those gears and they said it was huge difference.
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Old 02-20-2011, 09:11 PM   #3
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I guess i'm the only one that thinks 06 f7 gears are to high.
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Old 02-21-2011, 07:54 AM   #4
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I agree the stock ratio is a tad too high and plan to change mine next fall as well as add a 10 tooth driver.

Doing the ratios though the final drive of a stock DD is about 1.89:1. Going to a 63/57 brings that down to a 2.02:1. What I do not understand is that everybody says the gearing was better on the 03's and the reason for their speed. Yet the ratios on them with the stock 41/22 sprockets works out to be 1.86:1 Which is slightly higher of a gear so I would think the DD machines should be coming out of the hole better. Does going from a 9 to a 10 tooth driver make that much of a diference on stock gearing?

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Old 02-21-2011, 05:54 PM   #5
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 Quote: Originally Posted by shimxtr1 View Post
i agree the stock ratio is a tad too high and plan to change mine next fall as well as add a 10 tooth driver.

Doing the ratios though the final drive of a stock dd is about 1.89:1. Going to a 63/57 brings that down to a 2.02:1. What i do not understand is that everybody says the gearing was better on the 03's and the reason for their speed. Yet the ratios on them with the stock 41/22 sprockets works out to be 1.86:1 which is slightly higher of a gear so i would think the dd machines should be coming out of the hole better. Does going from a 9 to a 10 tooth driver make that much of a diference on stock gearing?
the ratios between a dd and a chain case sled seems to be a little different in some way. If you have a 06 f7 dd you already have 10 tooth driver's. I think 05 or a 06 f7 dd has plenty of potential to keep with a 03 chain case sled. I going to try 62/58 and go from there.
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