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Ideal Gear Ratio for 700R4

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Old Mar 24, 2014 | 10:03 PM
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cycleguy04's Avatar
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Car: 1983 Z28
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Transmission: TH400
Axle/Gears: 10 bolt, unknown gears
Ideal Gear Ratio for 700R4

Thinking about regearing. What would be the ideal gearing for a 700R4 for getting out of the hole at a decent speed?
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Old Mar 24, 2014 | 10:21 PM
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Car: `86 SS / `87 SS
Engine: L69 w/ TPI on top / 305 4bbl
Transmission: `95 T56 \ `88 200-4R
Re: Ideal Gear Ratio for 700R4

3.42 is the best balance.

If you really don't use the highway ever and are mostly in it to waste tires, or maybe if you have legit 6500 shift points, 3.73.
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Old Mar 24, 2014 | 10:34 PM
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From: Seattle
Car: 1983 Z28
Engine: life is more nifty with a chevy 350
Transmission: TH400
Axle/Gears: 10 bolt, unknown gears
Re: Ideal Gear Ratio for 700R4

How would 3.55 and a 28" tire be on the highway/around town?
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Old Mar 25, 2014 | 09:22 AM
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Re: Ideal Gear Ratio for 700R4

They don't offer a 355 for 10 bolt rear Fbody. 342 works well, in fact it was a little too much for my 350 tpi. If you are Tpi auto ,then don't go past 342, or you won't really have much of a first gear
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Old Mar 25, 2014 | 09:34 AM
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From: Texas
Car: 1989 IROC LSX
Engine: Swapped LS6 Forged by LME
Transmission: 4L65E
Axle/Gears: 3.73
Re: Ideal Gear Ratio for 700R4

3:42 FTW
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Old Mar 26, 2014 | 12:13 AM
  #6  
cycleguy04's Avatar
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From: Seattle
Car: 1983 Z28
Engine: life is more nifty with a chevy 350
Transmission: TH400
Axle/Gears: 10 bolt, unknown gears
Re: Ideal Gear Ratio for 700R4

Originally Posted by Bigfoottpi11
They don't offer a 355 for 10 bolt rear Fbody. 342 works well, in fact it was a little too much for my 350 tpi. If you are Tpi auto ,then don't go past 342, or you won't really have much of a first gear
Carbed. What is the ideal tire diameter for 3.42 at the drag strip with a 700R4?
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Old Mar 26, 2014 | 10:08 AM
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From: Spokane WA
Car: 92 Lingenfelter Z28 articwhite
Engine: Aluminum 615BBC
Transmission: Th400wbrake/curri entps9" locker
Axle/Gears: 4.11/4.30/4.56
Re: Ideal Gear Ratio for 700R4

Most of rhe taxi cab cars/every day drivers..grocery getters. Stay under 4 10.
for drag racing. It all depends on the car I just got my second third member.all aluminum carrier. Set up with 4 30 gears. But then again my tires are 29 inches tall.
and I'm running a six pinon planet.

Last edited by articwhiteZ; Mar 26, 2014 at 10:12 AM.
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Old Mar 26, 2014 | 02:36 PM
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cycleguy04's Avatar
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From: Seattle
Car: 1983 Z28
Engine: life is more nifty with a chevy 350
Transmission: TH400
Axle/Gears: 10 bolt, unknown gears
Re: Ideal Gear Ratio for 700R4

Originally Posted by cycleguy04
Carbed. What is the ideal tire diameter for 3.42 at the drag strip with a 700R4?
^
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Old Mar 26, 2014 | 02:47 PM
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Engine: Vortec 4200 Inline 6 PT70 Turbo..
Transmission: 4L65E
Axle/Gears: 3.73
Re: Ideal Gear Ratio for 700R4

My car runs 126 in the quarter

I am spinning 6600 in third gear.(this is my shiftpoint too, I have third MAX'D out)

I have a 3.73 gear and 25.6" tires (315/35/17).

This is about 600hp at 3700lbs.


My old TPI engine that ran 14's had a 3.73 also. Heavy, not much power, and it was out of breath after girst gear. 3.42's would have been just fine. Goodluck!
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Old Mar 26, 2014 | 03:07 PM
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From: Austin TX
Car: 89 Formula
Engine: 383 SBC/HSR
Transmission: 700R4
Axle/Gears: 3.73
Re: Ideal Gear Ratio for 700R4

If you're running a 28" tall tire, I'd definitely go with 3.73's.

If you're running a 26" tall tire 3.42's offer a nice balance.
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Old Mar 27, 2014 | 12:19 AM
  #11  
cycleguy04's Avatar
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From: Seattle
Car: 1983 Z28
Engine: life is more nifty with a chevy 350
Transmission: TH400
Axle/Gears: 10 bolt, unknown gears
Re: Ideal Gear Ratio for 700R4

I got 255/60's which are about 27". I'll see how it goes.
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