RPMs with different gear selections?

uhoh5.0

Founding Member

Mar 14, 2002

354

0

17

Montgomery, AL

Jul 27, 2006

#1

• Jul 27, 2006

• #1

Just wondered if I could get some feedback from auto guys with different rearend gears. I not trying to start the debate again about which ratio to choose, but rather what are your cruising rpms at say 60mph with 3.73s v/s 3.90s v/s 4.10s. Also, if anyonw has access to an automated gear ratio calculator for our cars that would work too. Also, I tend to drive with the O/D off, as i don't really like to be shifting in and out of 4th all the time. So, I am about 2700 or so when I'm in the upper 60 mph range. what kind of rpms would I be at with the O/D off and going like 65 with (3.73, 3.90, 4.10 etc.)

Thanks for any info!

 

03ghoststang

Well-Known Member

Jul 16, 2005

1,930

1

57

Los Angeles, California

Jul 27, 2006

#2

• Jul 27, 2006

• #2

well with 4.10's in 3rd im around 2500rpm @ 45 mph

and at 70mph in the highway around 2600 rpm

when i had the 3.73's i cant remeber at 45 mph but at 70 mph i was at 2400 rpm

 

Outlaw97GT

Member

Sep 10, 2005

234

0

16

Redneckville, Tx

Jul 27, 2006

#3

• Jul 27, 2006

• #3

With the o/d off driving at 45mph Im at 2500rpm. If Im going to be driving faster than 45 I turn the o/d on with the 4.10's.

With the o/d on driving at 55mph @ 2100, 70mph @ 2600, 80mph @ 3000, 90mph @ 3400 and, 115mph @ 4300.

Hope this helps....

 

uhoh5.0

Founding Member

Mar 14, 2002

354

0

17

Montgomery, AL

Jul 28, 2006

#4

• Jul 28, 2006

• #4

Outlaw97,
Is yours an auto also? Very helpful!
Thanks

 

jeffnoel

Founding Member

Aug 31, 2002

1,638

5

37

Clovis, CA

Jul 28, 2006

#5

• Jul 28, 2006

• #5

His sig says Rio Red Auto.

http://www.wcfords.com/stuff/calcs/EGTcalc/egtcalc.php

 

T

tcuallstar

New Member

Jul 24, 2006

3

0

0

houston tx

Jul 28, 2006

#6

• Jul 28, 2006

• #6

http://www.tchracing.com/tech/gearcalc.php?tirenum1=245&tirenum2=45&tirenum3=17&diameter=&finalgear=3.90&transmission=tr3650&operation=rpm&givenval=80&givenvaltype=MPH&selectedgear=5
Here you go!

 

G

GodAmGT00

New Member

Jul 28, 2006

75

0

0

Massachusetts

Jul 28, 2006

#7

• Jul 28, 2006

• #7

I have 3.73's, and at ~85mph, I'm at about 3k RPMs. I don't know if that's absolutely normal, since my Speedo is still acting flaky after the recalibration, so I may be going a little slower than that....



JT

 

uhoh5.0

Founding Member

Mar 14, 2002

354

0

17

Montgomery, AL

Jul 28, 2006

#8

• Jul 28, 2006

• #8

Thanks for the calculators, thats exactly what I was looking for!!! Sorry about the stupid question in the previous post, thought I was in a different thread.