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4.6L General Discussion This section is for non-tech specific information pertaining to 4.6L (Modular) Mustangs built from 1996 to 2004.

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Old 05-13-2012, 12:01 AM   #1
ctgreddy
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Join Date: May 2007
Vehicle: '95 gt 347
Location: Westland, MI
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Default how much will i lose now going to 3.73's?

my rear end is starting to make some god aweful noises. currently i have 4.10's and stock everythign else. so i'm thinking of swapping to 3.73's along with the usual 31 spline setup. reason for the 3.73's is this winter the forged motor will go in, along with the blower i'll be getting, and with that and in combination of the nitrous i'll surely be trapping higher than my 4.10's will let me. Just curious how much time i'll lose currently by downgrading.
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'03 cobra- 2.8 KB mammoth, 19lbs, bolt ons, rxt clutch, sra w/ 3.73's

654/546 whp/tq

Old setup - Ported eaton, 16lbs, minor bolt ons, sra, self tuned.

501/501 - 11.23@124
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Old 05-13-2012, 06:15 AM   #2
TRUEBLUE3934
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Location: NC
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Default

Quote:
Originally Posted by ctgreddy View Post
my rear end is starting to make some god aweful noises. currently i have 4.10's and stock everythign else. so i'm thinking of swapping to 3.73's along with the usual 31 spline setup. reason for the 3.73's is this winter the forged motor will go in, along with the blower i'll be getting, and with that and in combination of the nitrous i'll surely be trapping higher than my 4.10's will let me. Just curious how much time i'll lose currently by downgrading.
When I dropped from 4.10 back to the 3.73, my biggest issue was trying to launch the car. It was so much easier to bog the motor with the reduction in torque multiplication. My 1/4 ET slowed by 0.2-0.25 when I went back to the 3.73.

Your results will vary due to many variables, but that was my experience.
GOOD LUCK with all of your planned upgrades!!!
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Old 05-13-2012, 10:53 AM   #3
justinschmidt1
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If you need more MPH your gonna have too....

I was running out of gear with 3.73s on my last setup trapping 121, I guess cause its an auto it had a bit of slippage up top.
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Vortech PI 4.6, built 4r70w with 3800 stall, 385 rwhp
11.35 @ 121 1.65 60

Turbo
541/560 15 psi
10.77@132 1.78 60
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Old 05-13-2012, 11:24 AM   #4
ctgreddy
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well according to cliffy's gear calculator site i can get to 129 with 3.73's, 26" tire and revving to 6500. and with a 28" tire up to 140. I'd hope between the blower/nitrous combo I will be in the 130 area. plus, 3.73s will help my mpg's on the trip to myrtle as well haha.
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'03 cobra- 2.8 KB mammoth, 19lbs, bolt ons, rxt clutch, sra w/ 3.73's

654/546 whp/tq

Old setup - Ported eaton, 16lbs, minor bolt ons, sra, self tuned.

501/501 - 11.23@124
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Old 05-13-2012, 05:48 PM   #5
justinschmidt1
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Well you will find out, if your revving to 6500 rpms you should be good.

I swear my car on a 26 inch tire with 3.73s was going through the traps at 6200 rpms at 120-121 mph though.
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Vortech PI 4.6, built 4r70w with 3800 stall, 385 rwhp
11.35 @ 121 1.65 60

Turbo
541/560 15 psi
10.77@132 1.78 60
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Old 05-13-2012, 06:30 PM   #6
ctgreddy
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I dunno, this is just what that calculator said. It's pretty much exact right now tho it says at 6500 with my tires/4.10's I should get to about 115 which is right about where it gets to.
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'03 cobra- 2.8 KB mammoth, 19lbs, bolt ons, rxt clutch, sra w/ 3.73's

654/546 whp/tq

Old setup - Ported eaton, 16lbs, minor bolt ons, sra, self tuned.

501/501 - 11.23@124
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Old 05-13-2012, 07:01 PM   #7
dwtjr3
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I need to switch to 3.73s. I have 4.10s and I was tapping the rev limiter when I went to the track. My rev limiter is set at 6100
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Old 05-13-2012, 07:08 PM   #8
ctgreddy
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Quote:
Originally Posted by dwtjr3 View Post
I need to switch to 3.73s. I have 4.10s and I was tapping the rev limiter when I went to the track. My rev limiter is set at 6100
well drive on over and i'll do 'em for a good price.
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'03 cobra- 2.8 KB mammoth, 19lbs, bolt ons, rxt clutch, sra w/ 3.73's

654/546 whp/tq

Old setup - Ported eaton, 16lbs, minor bolt ons, sra, self tuned.

501/501 - 11.23@124
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Old 05-13-2012, 08:10 PM   #9
97stanger
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yo ct where are you staying in myrtle? I'm guessing for MW right? I cant wait man should be a sick time
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Old 05-13-2012, 08:14 PM   #10
ctgreddy
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I'll be in the holiday inn club vacations hotel, about 200ft off the ocean. I'm pumped man cant wait!
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'03 cobra- 2.8 KB mammoth, 19lbs, bolt ons, rxt clutch, sra w/ 3.73's

654/546 whp/tq

Old setup - Ported eaton, 16lbs, minor bolt ons, sra, self tuned.

501/501 - 11.23@124
ctgreddy is offline   Reply With Quote
Old 05-13-2012, 08:14 PM
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