relative strength of 9" vs 8&3/4" diffs - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
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post #1 of 28 (permalink) Old 06-17-03, 05:52 AM Thread Starter
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relative strength of 9" vs 8&3/4" diffs

I am thinking about changin the standard item in my EL to a 9" arrangement for increased strength (and to take advantage of the superior clutch-pak LSD).

Does anyone know how much stronger the 9" diff is?
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post #2 of 28 (permalink) Old 06-17-03, 06:14 AM
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The 9" is bloody heavy and IS detromental to good handling...Maybe the question should be "Is there agood LSD that can fit the B/W" ????

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post #3 of 28 (permalink) Old 06-19-03, 06:09 PM
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You will also loose about 30HP to turn the 9" so unless you are going to update or feed those neddies some extra "Hay" it will be not worth the effort.

"Fords R Tuff"

"Big Blocks" make them Tuffer.

You can beat Horsepower but you can't beat Cubic Inches.

Fords came out with Big Engine bays, Fill them with a "Big Block"
That's the way they should have been.
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post #4 of 28 (permalink) Old 06-19-03, 07:32 PM
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Re: relative strength of 9" vs 8&3/4" diffs

you can get your Borg Warner to handle some serious HP as they can put VL diff gears into it as well as ford gears, which gives you a pretty big range of options. Would be cheaper to replace if you break it too.

Get your BW converted to 4 pin LSD. This is enough for a good 1000HP at the fly.

Then watch your tyres melt away. hehehehehe

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post #5 of 28 (permalink) Old 06-19-03, 08:07 PM
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A competant diff shop can build you a BW with stronger gears(made in australia) and a hydratrak quite easily.
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post #6 of 28 (permalink) Old 06-19-03, 09:06 PM Thread Starter
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OK. I have a hydratrak lying around in the garage. I have no idea how this type of LSD works, nor any idea of it's robustness. Does anyone out there have any experience with these. They were, I believe, standard equipment on the EL GT and in a lot of HSVs. The standard cone arrangement LSD requires constant rebuilding. We are looking at going to a spool, but do not have time to test this in the car until Mid July, but more likely mid August.

Any thoughts on the Hydratrak appreciated.

cheers,
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post #7 of 28 (permalink) Old 06-20-03, 01:57 AM
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Re: relative strength of 9" vs 8&3/4" diffs

Good luck finding falcon hydratrack axles!

If you're not driving a manual you're really just steering.
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post #8 of 28 (permalink) Old 06-20-03, 02:01 AM
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Re: relative strength of 9" vs 8&3/4" diffs

Excuse my ignorance, what's a hydratrack?

Last edited by rossi; 06-20-03 at 02:14 AM.
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post #9 of 28 (permalink) Old 06-20-03, 04:43 AM
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Re: relative strength of 9" vs 8&3/4" diffs

Okay, first things first. A 9" does not take 30hp more to turn. This is bollocks. Vl diff gears will fit, but I wouldn't try to run more than 450/500fwhp through them. Anthing more than 650fwhp is going to push the friendship with a BW 75 or 78 series diff, regardless of gears used. At the upper limits, gear strength is not the issue, you are risking outright hemisphere or axle failure. Hydratrack are good in theory, but can be troublesome in use. They use a special coupling to join the axles together instead of the usual cones, and thus require special axles.(and hemisphere, of course) What application is the car to be run in?

If you're not driving a manual you're really just steering.
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post #10 of 28 (permalink) Old 06-20-03, 05:41 AM
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So your saying that 9" diffs do use up extra "HP" ?

How long have you been around as it has and is a known factor, that it does use extra "HP" to run a 9".

Tell me is there a difference in the Weight of a 9" to a Borg Warner diff ?

Is there more moving parts in a 9" ?

this is only to mention a couple of points.

"Fords R Tuff"

"Big Blocks" make them Tuffer.

You can beat Horsepower but you can't beat Cubic Inches.

Fords came out with Big Engine bays, Fill them with a "Big Block"
That's the way they should have been.
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