Transmissions and Drivetrain Need help with your trans? Problems with your axle?

torn between 3.54 and 3.75

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Old Feb 8, 2007 | 06:40 AM
  #1  
anesthes's Avatar
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From: SALEM, NH
Car: '88 Formula
Engine: LC9
Transmission: 4L60E
Axle/Gears: 3.89 9"
torn between 3.54 and 3.75

I don't know what to choose.

Car weighs about 3400lbs with me in it.

Tires are about 25"

Peak HP RPM should be about 6000.

Question is, n/a, will the car go in the 1/4 in terms of MPH.

Desktop dyno says my combination is 500hp at 6000rpm. (in sig)

My calculator says thats 400 rwhp with a 700R4, which is 11.8 @ 114mph.

With 3.54 gears, i'd cross the finish line @ 5400RPM in third.

With 3.75 gears, i'd cross the finish line @ 5800RPM in third.

The 3.54's would make the car 126mph capable in the 1/4, if I had more HP (nitrous?) The 3.75's will redline at 119mph @ 6000rpm.

Any thoughts?

-- Joe
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Old Feb 8, 2007 | 08:50 AM
  #2  
abyliks's Avatar
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Joined: Oct 2006
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From: ludlow mass
Car: 02 Mustang
Engine: 3.8 about to be punched out to 4.3
Transmission: 4R70W
Axle/Gears: 3.73 Detroit true trac
you want to cross the 1320 mark in your 1:1 gear at or right below your peak power point, do you plan on doing many more mods?

if your going to be adding nitrous, i would do the 3.54s if your done, i would go with 3.75s
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Old Feb 21, 2007 | 01:51 PM
  #3  
rwdtech's Avatar
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From: Indianapolis
Car: 1991 Z28 (sold)
so what is this, a track only car? do you plan on driving it around town or are you building it just for the track? 700R4 has a pretty steep first gear to begin with. it doesnt seem like you will be making a lot of low end power though
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