Axle ratio ?
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Freshman User
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Axle ratio ?
trying to fig out my gears without counting the teeth if i jack it up and turn the tires one tunr of the tire the driveshaft turns 1 1/4 any idea what gears i have the truck has a 4 speed
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
Originally Posted by onepeiceatatime
trying to fig out my gears without counting the teeth if i jack it up and turn the tires one tunr of the tire the driveshaft turns 1 1/4 any idea what gears i have the truck has a 4 speed
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
Originally Posted by onepeiceatatime
the thirdmember has know ID tag on it was trying to find a eaier way than ****ing the teeth but thany you
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Joined: Mar 2007
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From: Lexington, VA
Sometimes the numbers on the gear are teeth count numbers, and you just divide.
If you are looking at the ring gear just count the teeth on that and the pinion, and divide, this is the most accurate method.
If you want to count turns, turn both wheels at the same time 10 turns, count pinion turns, then divide pinion turns by 10, this will be close.
Or turn one wheel 20, hold the other, and divide pinion turns by 10, close again.
Grigg
If you are looking at the ring gear just count the teeth on that and the pinion, and divide, this is the most accurate method.
If you want to count turns, turn both wheels at the same time 10 turns, count pinion turns, then divide pinion turns by 10, this will be close.
Or turn one wheel 20, hold the other, and divide pinion turns by 10, close again.
Grigg
Senior User
Joined: Jun 2006
Posts: 253
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From: L.I.
there is an easier way with out doing any math. lift the wheels of the ground mark one wheel with crayon at 6 o'clock position than mark driveshaft at 6 o'clock. than count drive shaft turns till mark on wheel is back at the 6 o'clock position. example 3 1/2 turns on shaft one turn on wheel 3.50:1 ratio.
joe
joe
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i have did that one but what it came out to was 1 1/4 turns of the drive shaft to one turn of the tire
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From: Lexington, VA
Sounds like you lifted one wheel, turned the driveshaft, and got 1.25 turns? If so then the mistake you made is not lifting both wheels, because of the differential and how it works when only one wheel turns it turns twice as fast as two wheels were turning. So, if you git 1.25 turns of a wheel to one driveshaft then multiply by two and you may have 2.5 ratio. This method is fairly inaccurate, and why I listed a better method in my first post.
By using more turns and dividing you have less error.
Try it my way, and let us know what you find.
If you want to count turns, turn both wheels at the same time 10 turns, count pinion turns, then divide pinion turns by 10, this will be close.
Or turn one wheel 20, hold the other, and divide pinion turns by 10, close again.
Grigg
By using more turns and dividing you have less error.
Try it my way, and let us know what you find.
If you want to count turns, turn both wheels at the same time 10 turns, count pinion turns, then divide pinion turns by 10, this will be close.
Or turn one wheel 20, hold the other, and divide pinion turns by 10, close again.
Grigg
Junior User
Joined: Mar 2007
Posts: 52
Likes: 0
From: Lexington, VA
What is your actual tire diameter?
With that info and this site you can get a good guess as to what you have. http://www.drivetraindirect.com/t_gear_calculator.htm
Good luck,
Grigg
With that info and this site you can get a good guess as to what you have. http://www.drivetraindirect.com/t_gear_calculator.htm
Good luck,
Grigg
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