rearend
Senior User
Joined: Jan 2000
Posts: 166
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rearend
Look and see if there is a little alum. tag attached to the rearend cover. A lot of times the ratio is stamped on this tag. If not, post the vehicle info from inside the driver's door and someone can decode the numbers.
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
rearend
Adam, the truck could be specked out in many different ways. I have found a lot of FEs & autos came in at around 3.00 in the rear. You will have to roll the truck (on very level ground)and count the revs of the driveshaft per one rev of the tire.
Good luck. :-)
John
jowilker
[link:www.ford-trucks.net/users/jowilker|Club FTE since 01 01]
[link:www.ford-trucks.net/users/jowilker/NCFTE.html|NC Truck Owners]
66F100s Rule
In the cool still quite of night you can hear chevies rusting away.
Good luck. :-)
John
jowilker
[link:www.ford-trucks.net/users/jowilker|Club FTE since 01 01]
[link:www.ford-trucks.net/users/jowilker/NCFTE.html|NC Truck Owners]
66F100s Rule
In the cool still quite of night you can hear chevies rusting away.
Senior User
Joined: Jul 1999
Posts: 472
Likes: 1
From: USA
rearend
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I agree with jowilker as far as the F100's, but I have seen lots of 2WD F250's around here (Midwest) with 3.54 and 3.73's in the Dana 60.
There is a much easier way to determine axle ratio, as the steel tag on the diff cover often can be hard to read. Jack up only one rear wheel and rotate that tire exactly TWO revolutions and count how many times the driveshaft rotated - that's your ratio. Chalk marks on the brake drum & backing plates helps you count the revolutions easier. You must rotate one tire TWO revolutions, or both tires ONE revolution which is more difficult with an "open" differential.
For those with trac-locs, jack up both rear tires and rotate them ONE revolution and count the driveshaft revolutions.
The axle code off of the door VIN tag tells you what ratio axle came ORIGINALLY with the truck, but who knows if it has been changed in 29 years...
Art
I agree with jowilker as far as the F100's, but I have seen lots of 2WD F250's around here (Midwest) with 3.54 and 3.73's in the Dana 60.
There is a much easier way to determine axle ratio, as the steel tag on the diff cover often can be hard to read. Jack up only one rear wheel and rotate that tire exactly TWO revolutions and count how many times the driveshaft rotated - that's your ratio. Chalk marks on the brake drum & backing plates helps you count the revolutions easier. You must rotate one tire TWO revolutions, or both tires ONE revolution which is more difficult with an "open" differential.
For those with trac-locs, jack up both rear tires and rotate them ONE revolution and count the driveshaft revolutions.
The axle code off of the door VIN tag tells you what ratio axle came ORIGINALLY with the truck, but who knows if it has been changed in 29 years...
Art
