differences between ratios
Posting Guru
Joined: Oct 2011
Posts: 1,179
Likes: 1
From: Pueblo, CO
Your gear ratio for your diffs is the ratio of turns of the driveshaft/pinion the the turns of the ring gear/tires.
The numbers you mention represent the number of turns of the pinion to one turn of the tires. You may see people say 3.55 or 4.56 gears but it's always to one or 3.55:1. So a 3.55:1 gear ratio means that the drive shaft will turn 3.55 turns for ever one rotation of the tires. A numerically lower ratio, often referred to as "taller" or "higher" gears, is good for fuel economy while a numerically higher ratio, referred to as "lower" is good for torque to pull heavy loads of turn larger tires.
So a 3.08:1 ratio is good for highway use in a truck that doesn't haul much and has stock tires, and a 4.10 ratio is good for a truck that either has larger than factory tires, depending on size, or for a truck that tows/hauls some.
The numbers you mention represent the number of turns of the pinion to one turn of the tires. You may see people say 3.55 or 4.56 gears but it's always to one or 3.55:1. So a 3.55:1 gear ratio means that the drive shaft will turn 3.55 turns for ever one rotation of the tires. A numerically lower ratio, often referred to as "taller" or "higher" gears, is good for fuel economy while a numerically higher ratio, referred to as "lower" is good for torque to pull heavy loads of turn larger tires.
So a 3.08:1 ratio is good for highway use in a truck that doesn't haul much and has stock tires, and a 4.10 ratio is good for a truck that either has larger than factory tires, depending on size, or for a truck that tows/hauls some.
Thread Starter
|
Elder User
Joined: Jul 2012
Posts: 769
Likes: 0
From: Poplar Bluff, MO
Okay let me go ahead and give you inside I what I'm doing I'm rebuilding the 302 in it now boring it .30 over, gt40 heads & intake, and a good truck cam... So I'm thinking 4.10:1 gears will make that truck haul ***
Laughing Gas
Joined: Mar 2009
Posts: 1,028
Likes: 0
From: long island
thats not a big deal. just dont plan on lifting it too much and it will look good and still haul ***. trying to turn huge tires sucks up fuel and power.
Posting Guru
Joined: Oct 2011
Posts: 1,179
Likes: 1
From: Pueblo, CO
Trending Topics
Thread Starter
|
Elder User
Joined: Jul 2012
Posts: 769
Likes: 0
From: Poplar Bluff, MO
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Thread
Thread Starter
Forum
Replies
Last Post
TNtrapper
Brakes, Steering, Suspension, Tires, & Wheels
3
Dec 14, 2006 08:26 PM