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Try to figure out my gear ratio

Started by jb666, August 01, 2010, 01:20:56 PM

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jb666

August 01, 2010, 01:20:56 PM
By using these #'s, and the fact that I'm running 275/60/15's on a 10" wide rim, what would you say I'm running for gears:



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1st


15 MPH - 1800 RPMS
20 MPH - 2300 RPMS
25 MPH - 3000 RPMS
30 MPH - 3500 RPMS


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2nd

25 MPH - 1800 RPMS
30 MPH - 2000 RPMS
35 MPH - 2400 RPMS
40 MPH - 2600 RPMS
45 MPH - 3000 RPMS


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3rd

30 MPH - 1800 RPMS
35 MPH - 2000 RPMS
40 MPH - 2100 RPMS
45 MPH - 2300 RPMS
50 MPH - 2400 RPMS
55 MPH - 2500 RPMS
60 MPH - 2800 RPMS


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These were clocked against a GPS that is VERY accurate to determine my speed.

I'm just curious, because I've had a couple of guys telling me lately they are running 3k @ 60MPH and run 4.10's.

:popcrn:

jb666

#2
August 01, 2010, 01:46:39 PM
Quote from: 71superbee on August 01, 2010, 01:41:41 PM
This may help

http://vexer.com/automotive-tools/speed-rpm-calculator

WOW that's very cool.. Thanks for the link.. Looks to me like I'm running 3.91's not 3.54's, but we'll see this week.

:cheers:

mikepmcs

#3
August 01, 2010, 01:59:14 PM
you could do the old count the revolutions of the driveshaft method.  ;D
Life isn't Father Knows Best anymore, it's a kick in the face on a saturday night with a steel toed grip kodiak work boot and a trip to the hospital all bloodied and bashed.....for reconstructive surgery. But, what doesn't kill us, makes us stronger, right?

jb666

#4
August 01, 2010, 08:15:38 PM
The verdict is in... 3.73's...  :cheers: Thanks for the help, but the only reliable method of testing confirmed this.  :2thumbs:

Rolling_Thunder

#5
August 02, 2010, 01:41:56 AM
thought it would have been closer to 3.91 ?  given the numbers you posted 
1968 Dodge Charger - 6.1L Hemi / 6-speed / 3.55 Sure Grip

2013 Dodge Challenger R/T - 5.7L Hemi / 6-speed / 3.73 Limited Slip

1964 Dodge Polara 500 - 440 / 4-speed / 3.91 Sure Grip

1973 Dodge Challenger Rallye - 340 / A-518 / 3.23 Sure Grip

greenpigs

#6
August 02, 2010, 05:44:45 AM
Quote from: Rolling_Thunder on August 02, 2010, 01:41:56 AM
thought it would have been closer to 3.91 ?  given the numbers you posted 

Same here since the info pointed to a 3.91 and 3.73's are not used often, Brian Snausheges runs 3.73's but thats in a Dana.
1969 Charger RT


Living Chevy free

jb666

#7
August 02, 2010, 05:52:35 AM
This is in a Dana also...

BlueSS454

#8
August 02, 2010, 11:57:24 PM
That's the same RPM my Chevelle runs at 60 MPH with 3.73's and a 275 60 15 rear tire.
Tom Rightler

suntech

#9
August 03, 2010, 04:05:27 AM
The calc sheet shows 3.91 so if you have 3.73 your tacho might be a little off.......something that is very common!
Since we only live once, and all this is not just a dressed rehearsal, but the real thing............ Well, enjoy it!!!!
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