Questions about gear ratio

hardtimes · 01-12-2016, 01:19 PM

I have a bracket car with a mild 408w shift at 6000.
Car has 4.33 gear and 28" slicks only crossing the 1/8th @5900 was thinking about putting more gear in it.
Looking at 4.56 or maybe 4.71. How much ET do you think this will pick up and which gear should I go to.
Also someone told me with more gear that the car would be more consistent (less effected by weather changes) is this true??

Jeff Blanchard · 01-12-2016, 09:52 PM

There are some good calculators available online to help when considering things like gear changes. One of them is Wallace Racing Calculators.com

GTX JOHN · 01-13-2016, 06:39 PM

If you have a effective converter that is sized correctly.......
I think the difference between the 1/8mile times with those
gear spreads would be well under a tenth.

The 1/8 mile times on my small block stockers going from
4.56 to 5.13 at sea level were well less than a tenth.

I am pushing 70 and sometimes start in 2nd gear now and then.....
the difference in 1/8 mile is under 2 tenths.

It is sure nerve wracking go thru the lights at 7700 instead
of 6900 in 1/4 miles.

01-12-2016, 01:19 PM	#1
hardtimes Junior Member Join Date: Sep 2012 Posts: 32 Likes: 0 Liked 0 Times in 0 Posts	Questions about gear ratio I have a bracket car with a mild 408w shift at 6000. Car has 4.33 gear and 28" slicks only crossing the 1/8th @5900 was thinking about putting more gear in it. Looking at 4.56 or maybe 4.71. How much ET do you think this will pick up and which gear should I go to. Also someone told me with more gear that the car would be more consistent (less effected by weather changes) is this true??

01-12-2016, 09:52 PM	#2
Jeff Blanchard Junior Member Join Date: Apr 2015 Location: Lowell, Indiana Posts: 35 Likes: 0 Liked 0 Times in 0 Posts	Re: Questions about gear ratio There are some good calculators available online to help when considering things like gear changes. One of them is Wallace Racing Calculators.com __________________ Jeff Blanchard 353C / Stock

01-13-2016, 06:39 PM	#3
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,710 Likes: 2,737 Liked 2,403 Times in 681 Posts	Re: Questions about gear ratio If you have a effective converter that is sized correctly....... I think the difference between the 1/8mile times with those gear spreads would be well under a tenth. The 1/8 mile times on my small block stockers going from 4.56 to 5.13 at sea level were well less than a tenth. I am pushing 70 and sometimes start in 2nd gear now and then..... the difference in 1/8 mile is under 2 tenths. It is sure nerve wracking go thru the lights at 7700 instead of 6900 in 1/4 miles. __________________ John Irving 741 Stock 741 Super Stock Last edited by GTX JOHN; 01-13-2016 at 06:46 PM.