rear axle ID
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rear axle ID
I cannot find the ID tag on my rear axle. I know it is a 9-inch and I know what it is supposed to be by the Vehicle Certification Label. It reads a axle code of 13 which is a 3750lb Ford with 2.75 gears. But, I know there are times when I some kind of posi-traction. Also, I think my speedometer is off about 5mph. I am very frustrated with that tag being gone. Is there any other to ID my axle?
Raphael188
Raphael188
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Joined: Feb 2003
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From: Roseburg OR.
rear axle ID
Have you read your post? I don't even know what you're asking. You seem to know the type and ratio of your rear end. You mention posi so I'm guessing you want to know if your diff has a limited slip. Jack up one side and put the truck in neutral and see if you can turn the one tire you have jacked up. If you can then it's an open diff or the LS is wore out.
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Joined: Sep 2001
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rear axle ID
Hello, welcome to FTE!
Take a look around in this forum. The users have detailed several different ways to ID the ratio and check any sort of traction control. The tranny guys can tell you how to change your speedo calibration also.
Take a look around in this forum. The users have detailed several different ways to ID the ratio and check any sort of traction control. The tranny guys can tell you how to change your speedo calibration also.
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New User
Joined: Apr 2003
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rear axle ID
I only wanted to know other ways to get specific id on my axle since the id tag is missing as I stated in my original post. my impressions of the axle dont match with the info I can find about it. maybe it has been replaced. i wont know if i dont cant find other ways to id it. i want to be criticized for asking a question.
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Joined: Dec 2002
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From: Billings MT
rear axle ID
Do this.
1. Block the front tires and put the transmission in neutral.
2. Jack up one tire, if you can spin it by hand, it is an open diff. Proceed to 4.
3. If you can't spin the tire then it is a limited slip unit and you will have to jack up the other side also.
4. Mark a line on the driveshaft pinion yoke and the differential (a reference line) Also you can put a chaulk mark on a tire and the concrete/dirt/asphalt whatever.
5. Have someone rotate the tire one full turn and count how many turns the driveshaft makes.
This will give you a close idea of the gearing. The only other option is to take the cover plate off and count teeth or look for the id markings on the gears.
1. Block the front tires and put the transmission in neutral.
2. Jack up one tire, if you can spin it by hand, it is an open diff. Proceed to 4.
3. If you can't spin the tire then it is a limited slip unit and you will have to jack up the other side also.
4. Mark a line on the driveshaft pinion yoke and the differential (a reference line) Also you can put a chaulk mark on a tire and the concrete/dirt/asphalt whatever.
5. Have someone rotate the tire one full turn and count how many turns the driveshaft makes.
This will give you a close idea of the gearing. The only other option is to take the cover plate off and count teeth or look for the id markings on the gears.
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rear axle ID
jbalestri- I did what you suggested and I can spin the tire. I can spin the tires on gravel and I will leave two tire tracks. Will an open diff do that? In snow I can put a couple hundred pounds in the back and I wont have any problems in the snow. There is my confusion- to me it acts like a limited slip with the wheels on the ground but Im not supposed to have one. Also, the driveshaft turns about 1 1/2 times for every turn of the wheel. Im so very confused my head hurts.
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Joined: Feb 2003
Posts: 2,153
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From: Roseburg OR.
rear axle ID
Raphael,
If you can spin one tire with the other one on the ground then it is either an open diff or a wore out LS. I've seen some open diff's that like to spin both tires and LS's like mine that won't.
As far as the driveshaft goes a lot of people prefer to turn the tire 10 times that way any slop in the drivetrain will be minimized. Do that and tell us how many times the driveshaft turns when you turn the tire 10 times.
If you can spin one tire with the other one on the ground then it is either an open diff or a wore out LS. I've seen some open diff's that like to spin both tires and LS's like mine that won't.
As far as the driveshaft goes a lot of people prefer to turn the tire 10 times that way any slop in the drivetrain will be minimized. Do that and tell us how many times the driveshaft turns when you turn the tire 10 times.
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