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Old 07-21-2008, 12:05 PM   #1
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75 m.p.h.-r.p.m.'s

Trying to make up my mind up on gears. I know I'm the first one to do this. 2001 GT auto - 3.73 - 3.90 - 4.10 ? Question - Anybody out there with these set ups, can you tell me what kind of r's your turning @ 75 m.p.h.? My best guess is 3.73 - 24 - 2500, 3.90 - 25 - 2600, 4.10 - 26 - 2700, am I anywhere in the ballpark?
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Old 07-21-2008, 12:30 PM   #2
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Re: 75 m.p.h.-r.p.m.'s

imma need time for this, what is your overdrive gear ratio?
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Old 07-21-2008, 12:42 PM   #3
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Re: 75 m.p.h.-r.p.m.'s

26.5" tires, and a .70 4th gear ratio(i think that is stock auto)

3.73- 75@2485RPM
3.90- 75@2597RPM
4.10- 75@2730RPM
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Old 07-21-2008, 05:10 PM   #4
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Re: 75 m.p.h.-r.p.m.'s

Thanx, thats about what I came up with too. Yes o.d., is .70.
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Old 07-22-2008, 08:13 AM   #5
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Re: 75 m.p.h.-r.p.m.'s

4.10 reccomended im leaving my 4.10s when i do my auto swap.
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Old 11-27-2009, 02:22 PM   #6
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Smile Re: 75 m.p.h.-r.p.m.'s

i have 3.73 in mine,2000 rpm@60mph,wished mine had stock 3.27
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