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Old 07-15-2013, 02:51 AM   #1
mustang_gt808
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Default reaching 120 mph slower? with 4:10

ok guys before i installed my 4:10s from 0-120 it seemed faster with my 3;55 gears? yesterday i opened it up from 0-120mph now with my 4:10 gears and it seamed when im passing 90 or 100mph it been slower reaching 120? i might be wrong but can anyone confirm this please. thanks guys
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Old 07-15-2013, 03:01 AM   #2
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you might have to shift sooner out of third, which might be slowing you down slightly?
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Old 07-15-2013, 04:18 AM   #3
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Quote:
Originally Posted by mustang_gt808 View Post
ok guys before i installed my 4:10s from 0-120 it seemed faster with my 3;55 gears? yesterday i opened it up from 0-120mph now with my 4:10 gears and it seamed when im passing 90 or 100mph it been slower reaching 120? i might be wrong but can anyone confirm this please. thanks guys
yep.

ratio 3.55/4.10 = 115%

from 60>120+ your engine is working just as much as it used to with 3.55s when doing 60*1.15>120*1.15 = 70>140.
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Old 07-15-2013, 06:01 AM   #4
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Auto or manual?
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Old 07-15-2013, 07:41 AM   #5
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Just like any other mod it's going to take you a bit to get use to (especially gears). I had a buddy that ran a 08 GT full bolt ons and ran a consistent low 13's. He put a supercharger on it and 1st time at the track he ran a 13.6. Once you get use to the new gears and get the shifting down correct you'll be pulling alot harder than with the 3.55's....
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Old 07-15-2013, 11:06 AM   #6
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Most guys I know who are serious about the 1/4th track run 4.10 and above...pretty sure there's a reason for that.
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Old 07-15-2013, 11:48 AM   #7
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Most guys I know who are serious about the 1/4th track run 4.10 and above...pretty sure there's a reason for that.
Yes....4.10's will get you in your power band quicker in a short quarter mile race. Many cars do 4.30, 4.45 and 4.88 but if you were doing a mile race 3.31 would be better suited for that.
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Old 07-15-2013, 02:57 PM   #8
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Well you do lose a little top end from a steeper gear ratio but you shouldn't be noticeably slower. Maybe you're just not used to the new gears yet.
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Old 07-15-2013, 03:55 PM   #9
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your acceleration should not be slower. You are either losing traction and spinning or your driving skills have not adapted yet.
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Old 07-16-2013, 02:42 AM   #10
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youll get used to the new driving and love the 4:10's
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Old 07-16-2013, 02:42 AM
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