Rear Axle Ratio
New User
Joined: Nov 2002
Posts: 5
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Rear Axle Ratio
I bought a 00' F250 SC 4x4 V10 earlier this year. I've read a sticker on the fron diff that has 3.73 written on it (I assume this is the ratio). I've tried to determine the rear axle ratio by using the rpm method, however, I run appx. 1825-1850 rpms at 60 mph with stock 265/75/16's. According to the FAQ's post, this would indicate 4.10's in the rear. The only sticker I can find on the rear has H138 on it. Could I have differnt axle ratio's between the front and rear?
Thanks for any help you can provide. I've already searched the last ten pages on the "Axle's..." Posting.
Thanks for any help you can provide. I've already searched the last ten pages on the "Axle's..." Posting.
Sit. Stay.
Joined: Oct 2001
Posts: 18,308
Likes: 20
From: Washington State
Rear Axle Ratio
No. You cannot have different ratios front and rear.
Those numbers provided are derived mathmatically. Real world conditions such as tire wear, tire inflation and your tachometer's and/or speedometer's display may alter them.
I think the 2 latter challenges may have more to do with it than anything since our tach's are not graduated in hundreds or fiftys of RPMs. And speedometers in modern vehicles are notoriously incorrect.
If you are wearing a 3.73 tag, then you got 3.73's. 4.10's are not an option on V10's. Which is too bad...but that's another thread...
Those numbers provided are derived mathmatically. Real world conditions such as tire wear, tire inflation and your tachometer's and/or speedometer's display may alter them.
I think the 2 latter challenges may have more to do with it than anything since our tach's are not graduated in hundreds or fiftys of RPMs. And speedometers in modern vehicles are notoriously incorrect.
If you are wearing a 3.73 tag, then you got 3.73's. 4.10's are not an option on V10's. Which is too bad...but that's another thread...
Post Fiend
Joined: Apr 2002
Posts: 5,438
Likes: 11
From: IN FRONT OF YOU
Rear Axle Ratio
This doesn't reallt pertain to this thread, but I remeber my friend who was a mechanic at the local jeep dealer telling me that they had a cheerokee that had two different ratios btween the front and back.
Took them a few days to figure out why it didn't want to move when it was in 4hi
Took them a few days to figure out why it didn't want to move when it was in 4hi
New User
Joined: Nov 2002
Posts: 5
Likes: 0
Rear Axle Ratio
Thanks for the help. I figured it must be 3.73, as I get a solid 14 mpg empty. My father-in-law took it to N. Mexico earlier this year on a hunting trip. About 900lbs in the bed, and pulling a trailer with about 4,000 lbs of gear and 4 wheelers.... still got 12 across Louisiana and Texas. I didn't believe it at first, but everyone on the trip attested to it.
Thanks Again!
Thanks Again!
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