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Old 12-23-2013, 02:27 PM   #1
re-rx7
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Default Choosing gear ratio.

As it sits right now I have 3:31's but with the upgraded 20's It has fallen some. Judging by the Tire size calculator Im ruunng somehwere around 3:19's or so. I originally wanted 3:55's so with this difference Im gonna go 3:73's and hopeflly my ratio will end up somewhere in the 3:60's.

Any input on this? Im also buying OEM Ford gears and not Ford Racing as they are made by a different company. I can get gears and bearing brand new from dealer for $152.00.
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Old 12-23-2013, 02:31 PM   #2
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Depends on your goal for the car. strip? autox? road race? roll race? I have 3.31 but with the shorter tires I will be running with my track wheels it ups my gear ratio right where I want it so I will likely not change mine.
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Old 12-23-2013, 02:34 PM   #3
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Originally Posted by 03MachMe View Post
Depends on your goal for the car. strip? autox? road race? roll race? I have 3.31 but with the shorter tires I will be running with my track wheels it ups my gear ratio right where I want it so I will likely not change mine.
Mexico mostly with very little Drag time. 3:19 is extrememly high and i hate it.
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Old 12-23-2013, 02:37 PM   #4
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Originally Posted by re-rx7 View Post
Mexico mostly with very little Drag time. 3:19 is extrememly high and i hate it.
then I would go with 3.73 if you plan to keep those wheels
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Old 12-23-2013, 02:39 PM   #5
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Originally Posted by 03MachMe View Post
then I would go with 3.73 if you plan to keep those wheels
I do for the forseeable future. Car takes awhile to climb the RPM band now. Its noticable.
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Old 12-23-2013, 03:19 PM   #6
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4.10s!
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Old 12-23-2013, 03:47 PM   #7
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Jesus Christ!!!
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Old 12-23-2013, 05:46 PM   #8
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Originally Posted by re-rx7 View Post
Jesus Christ!!!
No that's 4.30s. LOL
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Old 12-23-2013, 05:51 PM   #9
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Originally Posted by Darkhelmet22 View Post
No that's 4.30s. LOL
LOL I think 3:73 is more then enough.
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Old 12-23-2013, 05:57 PM   #10
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Originally Posted by re-rx7 View Post
LOL I think 3:73 is more then enough.
I had 4.10s in my 5spd GT and they were awesome.
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Old 12-23-2013, 06:13 PM   #11
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If your long term plans include a turbo(s), keep the 3.31s.
Otherwise, 3.73 is a good street, strip, 1/4 choice.
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Old 12-23-2013, 06:27 PM   #12
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Originally Posted by rlhay2 View Post
If your long term plans include a turbo(s), keep the 3.31s.
Otherwise, 3.73 is a good street, strip, 1/4 choice.
No F/I. Maybe juice later on but mostly motor.
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Old 12-23-2013, 11:49 PM   #13
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I'm in the same boat as you with 20's and 3.31's and yea....it take a while to climb. I'll be getting 3.73's here in the next month or two. If I get mine done before you I'll let you know how it is.
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Old 12-24-2013, 01:03 AM   #14
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Originally Posted by Futwa View Post
I'm in the same boat as you with 20's and 3.31's and yea....it take a while to climb. I'll be getting 3.73's here in the next month or two. If I get mine done before you I'll let you know how it is.
Just add boost, that will help it climb faster. Lol
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Old 12-24-2013, 01:03 AM   #15
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Originally Posted by Darkhelmet22 View Post
I had 4.10s in my 5spd GT and they were awesome.
That 3650 also had much different gear ratios.
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