gear ratio
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Senior User
Joined: Jan 2011
Posts: 128
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From: RED ROCK TEXAS
gear ratio
i have a 1982 f100 with a 302, im wanting to convert it to 4wd, i know its not a easy process but i have patients, and lots of time 
. i need to know the gear ratio on my truck, but i really dont understand gear ratio. can someone explain it to me and tell me what mine is
. i need to know the gear ratio on my truck, but i really dont understand gear ratio. can someone explain it to me and tell me what mine is
Moderator
Joined: Jan 2001
Posts: 56,995
Likes: 2,741
From: Virginia
Find a tag on the rearend or the code on the door jamb sticker. The tag will have some numbers, usually something like 3.50 and usually the "3" has a bolt hole punched through it. The door jamb will have a code we can look up if it's the original rear.
For example if it's 3.50, that means your driveshaft will turn 3.5 turns when the tire turns 1 turn. If you have a 3.08 ratio, the driveshaft will only turn 3.08 turns while the tire will turn 1 revolution. So a 3.50 ratio will make the engine turn faster than a 3.08 ratio, if you keep the same road speed.
For example if it's 3.50, that means your driveshaft will turn 3.5 turns when the tire turns 1 turn. If you have a 3.08 ratio, the driveshaft will only turn 3.08 turns while the tire will turn 1 revolution. So a 3.50 ratio will make the engine turn faster than a 3.08 ratio, if you keep the same road speed.
Post Fiend
Joined: Feb 2009
Posts: 8,005
Likes: 7
From: Ottawa, Ontario
We'll need the number on the sticker on the cab where the door shuts, has your VIN on it and everything.
You will see "Axle Code" on it, give us the axle code, we'll be able to tell you what is your gear ratio.
You will see "Axle Code" on it, give us the axle code, we'll be able to tell you what is your gear ratio.
