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Old 08-31-2011, 02:47 AM   #1
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98 GT gear questions

I have a 98 GT with im pretty sure 2.73's its an auto and I was going to rebuild my rear end within the next month. What ratio should I upgrade to? Its my daily driver and I do drive highway occasionally.
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Old 08-31-2011, 08:44 PM   #2
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I personally Like 3.90s. Alot of people do 4.10 but they are not very highway friendly. I'd say 3.73-3.90. I have 3.90 and it will run at about 2000 rpm at about 70. Obviously 3.73 would be even better on highway and they say it's the best drag gears on mustangs. With fat drag radials and 3.90 it will snap your neck lol
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Old 08-31-2011, 08:52 PM   #3
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I have 4.10s and I like them. They aren't as bad as everyone says on the highway. At 2500 in 5th gear I'm doing 70. It's about preference I guess.
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Old 08-31-2011, 08:59 PM   #4
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Lol I'm just saying for fuel economy the lower gears are better and just as good for performance
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Old 08-31-2011, 09:09 PM   #5
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Yea I hear that. I don't get great fuel mileage but if i was worried about mileage I would've bought a Prius that goes 0-60 in a week. I get around 20 mpg normal driving.
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Old 08-31-2011, 09:28 PM   #6
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WHAT. 20 mpg. How did you manage that. V6
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Old 09-01-2011, 06:03 AM   #7
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No it's 4.6. I just don't beat it all the time. When I enjoy driving, I get around 15.

---------- Post added at 09:03 AM ---------- Previous post was at 09:00 AM ----------

Before I put the gears in, I would get 26 mpg on the highway
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Old 09-01-2011, 06:32 AM   #8
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Oh highway lol I was gonna say how the hell do you get 20. Even with my economy tune I still only get an average of 16.5
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Old 09-01-2011, 07:22 AM   #9
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I average 20 with 373s and a vortech blower making 440rwhp. On highway i can get up to 25 if i stay at the right rpm range
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Old 09-01-2011, 07:41 AM   #10
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Re: 98 GT gear questions

4.30's. Wake that auto up. Then a 3000 stall. You have a V8 who cares about MPG. If so trade it in on a Fiesta.
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Old 09-01-2011, 07:44 AM   #11
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It's not just mpg though. Obviously the more prolong use of your motor at higher rpm the more heat it generates and heat equals damage over time
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Old 09-01-2011, 12:50 PM   #12
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Quote:
Originally Posted by 98RedGT
I have a 98 GT with im pretty sure 2.73's its an auto and I was going to rebuild my rear end within the next month. What ratio should I upgrade to? Its my daily driver and I do drive highway occasionally.
If it's the stock gears it's either 3.08 or 3.27. For the auto I would go for 4.10s or 3.90s. Mpg really isn't going to be too much different between those two.
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Old 09-01-2011, 03:48 PM   #13
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Re: 98 GT gear questions

3.73 would be a good gear and great upgrade from 2.73.. you will gain MPG in the city but lose some on the highway, say 2-3mpg highway~ maybe.

3.27 might be something you could also consider but the upgrade isnt that much really to justify from 2.73. I would go 3.73 or leave it as it is.


rebuild the tlok unit I am sure its in need
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Old 09-03-2011, 01:50 AM   #14
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Get the 3.73......
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Old 09-07-2011, 04:58 AM   #15
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Re: 98 GT gear questions

3.73 for sure... im on the 2.73s still but i put 60k on my car highway a year... so ill take the almost 30mpg (no joking a serious 29.8mpg @ 125 kph) on the highway. I turn about 1850rpm (thats 77.6mph ish in 5th.). Oh and if your really worried about fuel economy get the cats out lol ... made a big jump for me! (see my current thread it came with a price...)
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