Axle Code Please
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Elder User
Joined: Oct 2002
Posts: 513
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From: Lincoln NE
Axle Code Please
Okay, I'm starting to wonder if I know for sure what my axle ratio is in my 85 2wd f150 with a c6 tranny (which I'm told has a 1:1 ratio in top gear). The door jam sticker gives me a code of: 14 for the axle.
A while back, Steve83 ID'd it for me to be a:
Ford 9" 3.00 ratio, 3550lb. GAWR.
In another thread I was reading and come to find that the 3.00 is a higher gear. Going 55mph down the highway I run about 2100rpms; 60mph(which is the speed limit on state hwy's here) 2200-2300rmps. I've been thinking, at those speeds shouldn't my rpm's be lower with a 3.00 ratio. Also, I read somewhere that Ford was putting 8.8" rear ends into these particular years of f150's.
I'm not saying you're wrong Steve83, I'm just looking for a second opion.
Also, is this the kind of info that would be found on the axle tag?
The tag on the rear end reads:
S316D
3 00 9 5004
I can't tell if the first number in the last set of digits is a 5 or S.
A while back, Steve83 ID'd it for me to be a:
Ford 9" 3.00 ratio, 3550lb. GAWR.
In another thread I was reading and come to find that the 3.00 is a higher gear. Going 55mph down the highway I run about 2100rpms; 60mph(which is the speed limit on state hwy's here) 2200-2300rmps. I've been thinking, at those speeds shouldn't my rpm's be lower with a 3.00 ratio. Also, I read somewhere that Ford was putting 8.8" rear ends into these particular years of f150's.
I'm not saying you're wrong Steve83, I'm just looking for a second opion.
Also, is this the kind of info that would be found on the axle tag?
The tag on the rear end reads:
S316D
3 00 9 5004
I can't tell if the first number in the last set of digits is a 5 or S.
Last edited by nzabka; Jul 31, 2003 at 06:17 PM.
Posting Guru
Joined: Dec 1999
Posts: 1,903
Likes: 2
From: Copley, OH
Axle Code Please
You forgot to tell us your tire size. It makes a difference. If you're running 235/75-15s, they roll at about 722 revs per mile.
At 60 MPH you'd be turning 2166 RPM with a 3.00 gear and about 1985 at 55. I'm guessing you're running a slightly shorter tire or that ypur speedo is off by a hair. Either way it sounds like a 3.00 rear to me.
At 60 MPH you'd be turning 2166 RPM with a 3.00 gear and about 1985 at 55. I'm guessing you're running a slightly shorter tire or that ypur speedo is off by a hair. Either way it sounds like a 3.00 rear to me.
Thread Starter
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Elder User
Joined: Oct 2002
Posts: 513
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From: Lincoln NE
Axle Code Please
Okay. That is pretty close. I am running 235/75-15's. My speedo must be off a hair. I'm about 100 rpm's higher than what you listed. That 722 revs per mile was the number I was missing in trying to figure it out. One more question, how do you calculate that 722 revs per mile number?
Thanks strangeranger!
Hope I didn't dis you any steve83, but I had to ask around.
Thanks strangeranger!
Hope I didn't dis you any steve83, but I had to ask around.
Posting Guru
Joined: Dec 1999
Posts: 1,903
Likes: 2
From: Copley, OH
Axle Code Please
Originally posted by nzabka
One more question, how do you calculate that 722 revs per mile number?
One more question, how do you calculate that 722 revs per mile number?
