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Old 09-08-2006, 12:29 PM   #1
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New rear end?

Could anyone suggest what rear end I should put in my 98 automatic.I would like to be able to still drive on the highway without using a whole tank of gas.:drive: thanks
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Old 09-08-2006, 12:48 PM   #2
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Re: New rea end?

Unless you plan on a lot of mods, the stock 7.5 should be fine, but if you do, go ahead and get the 8.8. Either one really.
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Old 09-08-2006, 01:02 PM   #3
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Re: New rea end?

I think she's asking for gear ratios...

Is it a v8 or v6? I say either 4.10s or 3.73w
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Old 09-08-2006, 01:22 PM   #4
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Re: New rea end?

3:73 for 5 speed 4:10 for auto
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Old 09-08-2006, 01:47 PM   #5
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Re: New rea end?

3.73's will raise your rpms a modest amount, If I recall right I went up 400rpms~ from my 2.73 gears to 3.73 gears. If your car is a v6 then you have 2.73 for sure. If you have an auto 3.73 or 4.10s are good. Expect 2-3 mpg loss on the highway and to pick up about 1mpg in the city (depending on driving habbits)
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Old 09-08-2006, 07:02 PM   #6
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Re: New rea end?

Sorry for not being more specific. I'm going with an 8.8 I already have alot of mods on it. I'm just not sure if I should go with 3:55,3:73 or 4:10.
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Old 09-08-2006, 07:25 PM   #7
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Re: New rea end?

4.10's, or how about 4.30's. :burnout:
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Old 09-08-2006, 07:31 PM   #8
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Re: New rea end?

What mods? That may make a difference
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Old 09-08-2006, 07:32 PM   #9
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Re: New rea end?

WOW I was kinda wanting to avoid that. I was told that I should go with either 3:73 or 4:10.Does any1 have any idea why people suggest such large gears for automatics?
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Old 09-08-2006, 07:42 PM   #10
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Re: New rear end?

You gear automatics lower than you do manuals because automatic transmissions are geared higher in Mustangs I believe.
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Old 09-08-2006, 07:49 PM   #11
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Re: New rear end?

So far I have CAI,dual exhuast with Flowmasters, UDP, 56mm throttle body,p&p upper intake, 1.8 roller rockers,190 fuel pump and Superchip. But I'm going to get the SCT from vmptuning and 19 lbs injectors.
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Old 09-08-2006, 08:36 PM   #12
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Re: New rear end?

What kind of driving do you do? Mostly in the city or out on the highway?

If it's mostly highway driving, I'd get the 3.73s. If it's mostly stop and go, I'd get the 4.10s. The 4.10s may actually get better gas mileage than the 3.73s if you are constantly having to drive at 40 mph...
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Old 09-08-2006, 08:52 PM   #13
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Re: New rear end?

I have a 97 automatic with 4.10's and a t-loc and I would not trade them for 3.73's. Def go with the 4.10's
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Old 09-08-2006, 08:56 PM   #14
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Re: New rear end?

I'd have to say it's 50% street 50% highway. =( Thanks for all the help
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Old 09-09-2006, 03:02 AM   #15
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Re: New rear end?

so do you have a v8 or v6? either way... get 4.10s with an auto. :yup:

Even on the highway, I got like 23mpg with my sixer on the highway with 4.10s
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Old 09-09-2006, 05:53 AM   #16
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Re: New rear end?

Its a V6. And getting 4:10's isn't harmfull to the car.
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Old 09-09-2006, 10:08 AM   #17
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Re: New rear end?

I would assume it is a v6 because it has a 56mm throttle body (sorry didn't see your last post)
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Old 09-09-2006, 10:16 AM   #18
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Re: New rear end?

It's ok
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Old 09-09-2006, 10:55 AM   #19
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Re: New rear end?

nah its not harmful to the car
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