Car Maintenance : What Is a Gear Ratio?

A gear ratio is a generic term that is used to describe the relationship between a drive gear and the gear that is being driven. Find out why automotive gear ratios may refer to gears in the differential or transmission with help from an auto mechanic in this free video on gear ratios.

Expert: J.B. Hebert
Contact: www.wrxtra.com
Bio: J.B. Hebert is a machinist, metal fabricator, and auto mechanic who has been fixing and modifying all things mechanical for over 20 years.
Filmmaker: David Pakman

Category:

Autos & Vehicles

Tags:

• auto
• repair
• car
• maintenance
• troubleshooting
• problems
• automotive
• repairs
• vehicles
• gear
• ratios
• tires
• transmissions

[gammbitx21]

@WANAGOSCUBADIVE That's correct...

[WANAGOSCUBADIVE]

so are you saying that if i choose a truck with 4.10 instead of 3.73 that the 4.10 will be better at pulling because there would be a smaller gear spinning more times than the 3.73 4.10 is 4 and 1/10 rotations instead of 3.73 being 3 and 73/100 rotations?

[jomomd]

this guy has down syndrome

[wander20081]

@gmatamoros What you feel is normal. Faster at freewat speeds, dog on hills and from a dead start. Your speedometer will be off as you discovered. With the 89 you most likely have a gear driven cable. So you will need a new gear from a dealer. It's not a big job at all to change out.

[jerryf36]

WTF!!!!!!

[gmatamoros]

I changed the ratio in my car from 3.34 to 3.08. Somebody gave me the idea to do it because it saves gas and I did it. Is this a big difference? I do feel slower acceleration but seem to go faster on the freeway. I have noticed that my spedometer shows about 70mph when my actual speed is about 80mph. I am wondering if there is a gear ratio between 3.08 and 3.43 available for my car. A 1989 pontiac firebird.

[saifiddeen]

that is what we study in our college (univercity of technology) in baghdad

thanks for this lecture