5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

3.73 gears

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Old 02-11-2009, 04:52 PM
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kylem
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Default 3.73 gears

im thining about getting a set of 3.73 gears and new seals and bearings for my 8.8 in my 93 gt. also going to throw in a fully locking differential. i just want some input before i spend the money, i know this is going to kill my gas mileage, but how much? what kind of rpms would i be turning in 5th gear? and any other info yall wanna throw at me is appreciated. thanks.
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Old 02-11-2009, 04:55 PM
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grnstang
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It wont be too bad on the highway, 3.73's are a great gear for street driving and a little strip action in my opinion. I had 3.73's and I cannot remember what RPM it was at 60 mph...but I think around 2k maybe slightly lower?
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Old 02-11-2009, 05:02 PM
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Timspony
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with 3.73's you be pulling like 2,200 rpm's at 60 mph....You'll only loose about 2 mpg with the 3.73's....If your going through the cost of putting in bearings & a new carrier, I would convert to 31 spline axles if you plan on racing!

....about 2,000 rpm's with 3.55's
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Old 02-11-2009, 05:12 PM
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mjr46
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rpm for 3.73's will be fine as well as mpg
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Old 02-11-2009, 09:49 PM
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kylem
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thanks! i was thinking about the 31 splined axles and i think what im going to do is piece all the stuff together gradually, that way i dont dump 500 bucks at once. im 18 starting my career out as a service technican at a dodge dealership and between paying the tool guy off for 15000 worth of tools, i still want to have a car to play around in. haha. i just bought a mac catback for my car and it should be here tomorrow. and the next thing im going to buy is msd ignition system.
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Old 02-11-2009, 10:04 PM
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TrimDrip
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Originally Posted by timspony
with 3.73's you be pulling like 2,200 rpm's at 60 mph....You'll only loose about 2 mpg with the 3.73's....If your going through the cost of putting in bearings & a new carrier, I would convert to 31 spline axles if you plan on racing!

....about 2,000 rpm's with 3.55's
really, my car seems awful fast to be turning 1850 at 60 mph.
I guess my car could have 3.27s.
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Old 02-11-2009, 10:17 PM
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kylem
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if its stock gears it should be 3.08. correct me if im wrong.
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Old 02-11-2009, 10:41 PM
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in an automatic
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Old 02-12-2009, 05:04 AM
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Catchpole
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Originally Posted by kylem
if its stock gears it should be 3.08. correct me if im wrong.
There's 3 different gears that come stock in these cars. 2.73, 3.08, and 3.27 I think or something along those lines. There's a couple letters on your driver's side door jam that will tell you.
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Old 02-12-2009, 07:54 AM
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Originally Posted by kylem
thanks! i was thinking about the 31 splined axles and i think what im going to do is piece all the stuff together gradually, that way i dont dump 500 bucks at once. im 18 starting my career out as a service technican at a dodge dealership and between paying the tool guy off for 15000 worth of tools, i still want to have a car to play around in. haha. i just bought a mac catback for my car and it should be here tomorrow. and the next thing im going to buy is msd ignition system.
Do yourself a favor and choose a better career. You'll be sorry later in life!!
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