3.00 gears revs 3000 at 70mphs?

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LimeLight

New Member

Nov 29, 2005

11

0

0

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?

 

302 coupe

Founding Member

Mar 2, 2000

1,952

3

36

Macon, Ga.

Nov 30, 2005

#2

• Nov 30, 2005

• #2

yep. You're probably just used to having overdrive which your 65 does not have. If you have a newer vehicle so equipped, get it going 70 mph and switch the OD off, it will rev just as high or higher than your 65.

T5 swaps and AOD swaps are pretty common these days to get OD in an early stang. Do a search and you should find lots of information on what is involved in a swap, if you're interested.

 

mudbilly

Member

Jun 3, 2005

175

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16

South County, Maryland

Nov 30, 2005

#3

• Nov 30, 2005

• #3

with a 25" tire diameter you will turn 2822 rpm @ 70 mph with 3.00 gears........
or 3010 rpm @ 70 mph with 3.20

 

muddslide

New Member

Mar 10, 2003

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DAYTONA BEACH

Dec 1, 2005

#4

• Dec 1, 2005

• #4

Yes that sounds correct. I also have the same gear and at 3,000 rpm I'm at 68-72mph. Hope this helps

 

tylers65

I've got your tool right here!

Jan 7, 2001

3,278

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57

Tacoma, WA

Dec 2, 2005

#5

• Dec 2, 2005

• #5

I have 3.55 and run 3000 RPM at 60 MPH