Options 8.7 inch ring gear
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Trailering
Joined: Nov 2024
Posts: 15
Likes: 2
From: Washington coast
Options 8.7 inch ring gear
So I just got a 69 ford f100 I was told it had a 9 inch ford rear end, not so. It is the dreaded 8.7" 3.50 ratio with open 28 spline axle. My question is, is it a matter of just finding a 9" rear end axle to swap that possibly came out of a ford truck? What are the questions I need to be asking and looking for. I am not well versed in this area as you can tell. If you can dumb it down for me that would be appreciated.
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Trailering
Joined: Nov 2024
Posts: 15
Likes: 2
From: Washington coast
Well, my plan which is just starting at the dreamer stage is to restore the truck and beef up the motor in a rebuild. Mild cam, new heads, manifold, and carb upgrades. I am looking to boost a little more hp. In reading about the rear end everyone seems to have the same consensus and that is scrap it because you can't find parts and its not buildable. Right now it works
Logistics Pro
Joined: May 2015
Posts: 4,469
Likes: 965
From: Tri Cities, TN
There isn't anything wrong with the 8-3/4-inch ring gear (9-inch) rears. The weak point is the axles not the center section. That said those rears are generally considered good for up to 450 HP. Adding traction loc is as easy as swapping the center or having yours rebuilt and there are aftermarket 28 spline axles that are bullet proof. Unless you are drag racing with Big sticky tires that rear is plenty strong.
Thread Starter
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Trailering
Joined: Nov 2024
Posts: 15
Likes: 2
From: Washington coast
There isn't anything wrong with the 8-3/4-inch ring gear (9-inch) rears. The weak point is the axles not the center section. That said those rears are generally considered good for up to 450 HP. Adding traction loc is as easy as swapping the center or having yours rebuilt and there are aftermarket 28 spline axles that are bullet proof. Unless you are drag racing with Big sticky tires that rear is plenty strong.
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