rear end question
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Junior User
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rear end question
Ive asked a few questions already. I own a body shop and just bought a 56 f100 about a month ago. Ive already installed the 03 police interceptor front suspension and when i bought that from the yard i deal with he also put a bug in my ear about a motor he had. so about a week later there i was in the shop unloading a 2006 mustang roush engine and trans with the harness ecu and pretty much anything i need. The only thing i dont know is what rear end i should run with the supercharged roush motor. Any ideas?
Cargo Master
Joined: Mar 2001
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From: Elk River, MN
The Ford 9" is pretty much the gold standard and comes in lots of available interchangeable gear ratios. The newer Ford 8.8" is also strong enough as it had been used in trucks and muscle cars for many years.
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Junior User
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I was thinking of the 9" rear end but i just dont know what gear ratio. i guess id have to do some homework. i was also thinking about calling the yard back and trying to get the rear end out of the same car the motor came out of. But i just dont know if that rear would work with the truck? are they usually the same width or comparible even? i just dont wanna purchase the rear end that goes with the motor and not be able to use it.
Fleet Owner
Joined: Jul 2004
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From: NM
I'd assume whatever trans it has is an overdrive in top gear? So probably you'd want to be in the 3.50 - 3.73 range in the axle, depending on tire size. Depends how much you want to favor performance over mileage. Plenty of RPM calculators on the net.
Hotshot
Joined: Oct 2009
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From: Burbank, WA
You might check with your yard for an Explorer 8.8 rear. Those can be sourced with disc brakes and Traction-Loc®, good gear ratios for your application, they're the right width and go in fairly simply. The biggest hurdle typically is flipping the spring mount pads from the bottom side of the axle tubes to the top. Far more readily available and less expensive than a 9", and just as capable.
Logistics Pro
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From: u-rah-rah Wisconsin
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Junior User
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You might check with your yard for an Explorer 8.8 rear. Those can be sourced with disc brakes and Traction-Loc®, good gear ratios for your application, they're the right width and go in fairly simply. The biggest hurdle typically is flipping the spring mount pads from the bottom side of the axle tubes to the top. Far more readily available and less expensive than a 9", and just as capable.
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Hotshot
Joined: Oct 2009
Posts: 16,153
Likes: 4,751
From: Burbank, WA
That will depend totally on your desired cruising rpm range, tire size, final drive ratio, etc. I would think 3.73 should get you in the ball park, though, with an OD transmission. What ratio did the Roush Mustang come with? Somewhere close to that would be preferred, compensating for tire size differences, to keep the engine running in its designed parameters.
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