3.00 gears revs 3000 at 70mphs?

L

LimeLight

New Member

Nov 29, 2005

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Nov 29, 2005

#1

• Nov 29, 2005

• #1

Ok so I bought a fully restored 65 GT Fastback. The engine is working and sounds great. The only problem was that my speedometer was off by about 15 mph and it was reving very high, 3000 when i was at 55mph. So I checked the gear ratio and it was a 3.20. I put a 3.00 in and now it revs 3000 at 70mph. It has a 3 spd automatic transmission in it. I can feel it shifting through all gears, but should it be reving this high at only 70mph in 3rd gear?

 

iskwezm

10 Year Member

May 24, 2005

4,159

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79

Rowland Heights,California

Nov 29, 2005

#2

• Nov 29, 2005

• #2

yeah,thats about right if you have "short" tires

 

J

jbuening

Member

Apr 28, 2005

399

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Nov 30, 2005

#3

• Nov 30, 2005

• #3

I agree. I have around 215/70/15 tires and i run around 3k rpms @ 70mph. I have an FMX 3 spd auto, but they are all geared the same in 3rd (1:1). If you have confirmed the speed driving next to another car (via cell phone), then your speedometer may have not been that far off. You gearing may have increase your speed 5-10mph, but probably not 15mph at the same rpm.

 

LMan

Founding Member

Aug 10, 2002

1,246

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Mom's basement

Nov 30, 2005

#4

• Nov 30, 2005

• #4

sounds like you are hearing the siren song of overdrive

 

Tim65GT

Active Member

Feb 24, 2004

1,149

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39

West Texas

Nov 30, 2005

#5

• Nov 30, 2005

• #5

I have 3.00 with a C4 and 225/60-14's and it to0 is at 3000 RPM at 70 MPH.

An AOD is in my future plans.

 

mudbilly

Member

Jun 3, 2005

175

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South County, Maryland

Nov 30, 2005

#6

• Nov 30, 2005

• #6

bump

http://forums.stangnet.com/showthread.php?t=598578

 

KillerKittyCat

New Member

Aug 24, 2003

150

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Hammer Down - Behind The Wheel

Dec 4, 2005

#7

• Dec 4, 2005

• #7

I have the four speed with 300's and turn 2700 at 70 mph.
Fourth is 1 to 1. I checked the ratio based on my stock setup and the 2700 number is correct with 14 inch tires.

However the 2.92 first gear makes it go!!!!

 

KK6695GT

New Member

Nov 26, 2005

66

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0

Indiana

Dec 4, 2005

#8

• Dec 4, 2005

• #8

3000 @ 70 sounds like it's in the neighborhood. Depends on your tire diameter. My '66 w/ 205/70/14s runs 2980 RPM @ 70 w/ 3.25 gears.

 

R

Ronstang

New Member

Apr 4, 2004

1,294

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Houston Texas

Dec 4, 2005

#9

• Dec 4, 2005

• #9

I have a 3.98 gearset in the Shelby with 225/60-14s....you are lucky at 70 mph.