Ford 9" swap

94_CobRa · Nov 9, 2009

Hey guys, new to the forum.

I got a 94 cobra that im building up. Im going to put a 9" in it.

Anyone on here done this yet or know who has?

Thanks

Paul · Nov 9, 2009

I've not done it, but there are several companies that off bolt-in 9" axles for your car. Keep in mind though that the 8.8" axle can be built to withstand a ton of power, it's lighter, and the build will likely be less expensive.

94_CobRa · Nov 9, 2009

Thanks for the info.

I looked into building up my 8.8 and the cost difference was almost none.

Yea, its heavier and its a little overkill but i will probably never have to fix it. I like the idea of a 45min. gear change too.

Paul · Nov 9, 2009

What 9" axle are you planning on buying? And from where?

LAFENATU · Nov 9, 2009

31 Spline traction lok and 31 spline hardened axles will take A LOT of power.

Axles: http://www.summitracing.com/parts/ALY-12185/ $219

Ford Racing 31 Spline Traction Lok: http://www.summitracing.com/parts/FMS-M-4204-F318/ $259

That combo right there will easily take 500-600 HP

That is about $500 to do.

94_CobRa · Nov 9, 2009

for the 9", they are 31 spline moser axles.

yes, 500 for those parts. not including the cost for c-clip eliminators, gears, & install kit. then add $450 in california labor.

Comes out to about the same.

wayne94mustang · Nov 9, 2009

my old bronco has a 9'' rear and they do have a weak point that took me awhile to solve.

I'm on my 5th rear in 7 years, kept busting the main caps off.... long story short is i had big time axle tube flex.

once the center section is out the rest of the rear cant weigh more the 40lbs, real cheesy thin sheet metal. anyway, a weld on axle truss saved the day but if you make tons of torque and can get it to the ground you can/will break a 9''....often.

another thing to remember is the 9'' has a super low pinion gear so your drive shaft will be lower as well.

94_CobRa · Nov 9, 2009

I will not be breaking my nodular iron 9".

If i do its under warrenty.

Steven · Nov 9, 2009

Doesn't make much sense. Unless your consistently at the track, and chasing E.T.'s a 9" is really overkill. If price wise it comes out even, weight wise it does not as you obviously said. Your welcome to do what you want, I just find it a bit useless anymore outside of a track car use.