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What type of LSD Center is this?

Started by _Viper_ , Dec 05 2013 11:14 PM

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14 replies to this topic

#1 _Viper_

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Posted 05 December 2013 - 11:14 PM

Hey guys, this was in my car when I bought it... 9" Diff.

Hard to get a good look let alone a decent pic but there look to be a thick plate in between the gears with some shims on the outside..

What type of LSD is this? is it any good? pro's/cons?

The diff was making a really loud howling noise when Im just lightly on the throttle, goes away when you back right off. Is this just in the setup of the gears? There was abit of pitting on the gears but a couple of people have said its not a problem?

Thanks

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#2 S pack

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Posted 05 December 2013 - 11:26 PM

The pitting in the gears will be the cause of your whine/howl.

Looks like the pitting is only on the driven side of the teeth, hence why there is no noise when you back off the throttle.

Those crown wheel teeth are just waiting for the right moment to let go.

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#3 ls2lxhatch

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Posted 06 December 2013 - 02:51 AM

The thick plate could be the block in a four pinion centre? Sounds like you may have a factory style four pinion Trac-Loc clutch pack LSD.

There are some pictures here that may look familiar.

http://www.7173musta...d-a-ford-9-inch

Edited by ls2lxhatch, 06 December 2013 - 02:54 AM.

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#4 76lxhatch

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Posted 06 December 2013 - 06:22 AM

The pitting in the gears will be the cause of your whine/howl.
Looks like the pitting is only on the driven side of the teeth, hence why there is no noise when you back off the throttle.

Those crown wheel teeth are just waiting for the right moment to let go.

Unless the howl is more like a chatter, that's extremely unlikely given that only a few teeth have pitting. If the diff has been used recently I'd say the backlash is wrong because there are no witness marks from where the tooth contact should have been (looks like maybe its too far in toward the centre). This lines up with the description of the noise too.

External pitting is generally caused when the diff has been sitting around at some stage exposed to moisture and is not symptomatic of any metal failure, those teeth will probably last just as long as the rest of them. I would double-check when you get the contact pattern right that no metal is being removed by gear contact just to be sure, but I highly doubt it.

Can't really see any LSD components from that photo, is there room for a clutch pack as per the diagram above?

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#5 Marks LXTorana

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Posted 10 December 2013 - 11:07 AM

Turn the diff over and if LSD the back face of the crown wheel assembly will be machined. There will also be a
Few holes around the face and you will see the end of the clutch plates inside the holes (just).

Turn the diff over and if LSD, the back face of the crown wheel assembly will be machined. There will also be a few holes around the face and you will see the end of the clutch plates inside the holes (just).

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#6 _gearex_

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Posted 10 December 2013 - 11:48 AM

that is just a normal 9" limite slip, that block in the middle, is just a block that holds 4 little springs & has a metal tin cover that holds the springs in place, the whining noise is definetly from the worn out crown wheel & pinion gear set.

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#7 _Viper_

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Posted 28 December 2013 - 05:36 PM

Ok so I pulled the center apart and yep its like the first pic Andy / LS2LXHatch posted... so its just a stock Ford LSD... are they any good? or are they the type that keep going loose and need rebuilding every now and then?

Im considering getting a tru-trac as I have one in my other car and love it, but if this center is decent it would save me some coin...

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#8 Ice

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Posted 28 December 2013 - 06:44 PM

How much HP you got clint

Ive got a standard 9inch lsd in my van no probs at all

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#9 kiwi-lilj

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Posted 28 December 2013 - 07:18 PM

How much HP you got clint Ive got a standard 9inch lsd in my van no probs at all

Your van is just a static display though.

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#10 Ice

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Posted 28 December 2013 - 07:30 PM

Your van is just a static display though.

Only for the last 20 years blair
but i did put 70000 km on it

When did say you were leavin

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#11 kiwi-lilj

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Posted 28 December 2013 - 07:32 PM

Only for the last 20 years blair
but i did put 70000 km on it When did say you were leavin

Lol, should I start running now. :-)

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#12 Ice

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Posted 28 December 2013 - 07:37 PM

You can run but ya cant hide bud hehehehehe

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#13 _Viper_

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Posted 28 December 2013 - 09:10 PM

350rwhp for now...

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#14 Ice

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Posted 28 December 2013 - 09:18 PM

You wont blow that 9 inch clint

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#15 _Viper_

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Posted 28 December 2013 - 09:22 PM

Yea not worried about breaking it, just want a reliable lsd that will drive both wheels every time (except turning etc) and not be unpredictable and sometimes go single spinner. Also don't want to have to rebuild it every year.