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9" Ford axle question

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Old Jul 23, 2024 | 01:49 PM
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Jeff Wecker's Avatar
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From: Abilene Ks
9" Ford axle question
I currently have 3.54 gears in my 1973 F100. I want to find something more highway friendly, like a 2.73 or 3.08 center section.. What I need to know, is what axle code I need to look for,to get what I need. Also, what years will work, and what axle spline count I need.I do not do any towing, it is mainly for cruising


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Old Jul 23, 2024 | 02:11 PM
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I made a trailer from rear half of a '79 automatic 351M wrecked F-150, I believe it had 2.75:1 when I removed them. Maybe was 2.73:1 .... was a good 30+ years back.

I guess I should have kept them? I am totally happy with my trucks 3.50 rear, from Main to Alabama, south Georgia, points in between, but 60-63 is the sweet spot.
 
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Old Jul 23, 2024 | 02:30 PM
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Just get the ring and pinion you want and throw them in there. Ford 9" is pretty easy to do.
 
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Old Jul 23, 2024 | 03:06 PM
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Attached pictures show the axle codes for the trucks.

 
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Old Jul 23, 2024 | 03:27 PM
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are you 100% sure you have a 9" rear diff?
 
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Old Jul 23, 2024 | 04:05 PM
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3.54 is a Dana ratio. Ford is 3.50. You may find a 3.54 in front and 3.50 in back with a 4x4 for example.

If it's a Dana, 3.54 is it afaik.


 
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Old Jul 23, 2024 | 05:27 PM
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Whoops may have jumped the gun there. Forgot they put Dana’s in half tons.
 
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Old Jul 23, 2024 | 05:40 PM
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Hhhhmmm. I think '79 is past the era of Dana 44s in F100s as the limited slip option.

OP needs to check.....




 
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Old Jul 24, 2024 | 05:47 PM
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I swapped 3.00 gears in place of 3.50 in both of my 79 Broncos. Way more comfortable at highway speed. 80 mph is no biggie.
 
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