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9" Diff ratios

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Old Sep 14, 2008 | 06:47 AM
  #1  
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Default 9" Diff ratios

Does anyone know the different ratios? I'm thinking of getting the low ratio one to improve acceleration as im not too bothered about top speed. How much are they nowadays?

Anyone got one for sale lol.
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Old Sep 14, 2008 | 08:58 AM
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it may sound back to front, but its the higher ratio you need to improve acceleration.

on the 7" and 7.5" diffs for example - standard is 3.62 or 3.64, but to improve acceleration (at the sacrifice of a small top speed figure) many people change up to a 3.9.
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Old Sep 20, 2008 | 09:37 AM
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You can go up to 4.44 on a 9" diff, and up to 5.11 but on 7" or 7,5".
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Old Sep 20, 2008 | 10:20 AM
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lowest ratio on 9inch afaik is 4.4 and highest is 3.6 also get 3.9 which is rare,
if you use 4.4 on a standard ratio box 1st is usually far too low which with having to change so soon can make it slower acc.
boxes designed to be used with 4.4 usually have a higher fisrt gear
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Old Sep 20, 2008 | 10:34 AM
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Originally Posted by andrewg
lowest ratio on 9inch afaik is 4.4 and highest is 3.6 also get 3.9 which is rare,
if you use 4.4 on a standard ratio box 1st is usually far too low which with having to change so soon can make it slower acc.
boxes designed to be used with 4.4 usually have a higher fisrt gear
do they not do a 3.2 or something ? in 9inch?
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