Identifying diff - LSD or not?

archangel62 · Post by **archangel62** » Mon May 17, 2010 8:42 pm

How can I tell if my non-driving Piazza has an LSD without pulling it apart?

Distinguishing marks? Chassis number details?

I can post pics if that'd help.

Cheers
Eli

IZU069 · Post by **IZU069** » Tue May 18, 2010 12:40 am

Handbrake off.
Lift one rear wheel, place it in neutral. Can you spin it? (No = LSD)

Or lift both rear wheels. In gear spin either? No = LSD.
Out of gear, spin one. Does the other spin in the opposite direction? No - not LSD.
If both spin in the same direction; = LSD.

Exceptions - welded or stuffed diffs (broken/seized spiders etc).

Visually - remove the banjo and look for clips either side - in inside cage at either end.
Piazzas only (usually) have the clutches on one side; other Isuzus (Jackaroo, Rodeo etc until 4ZE1 - interchangeable banjos with Piazza except for 4.55 ratio) have them both sides.

No external markings etc.

archangel62 · Post by **archangel62** » Wed May 19, 2010 1:59 am

Nice, great reply. I figured if there were no obvious external markings I could try the physical test, but was hesitant in case of locked diff, stuffed clutches, or stuffed diff! But alas, I could get lucky and actually have symptoms befitting the circumstance (for once!) haha...

Cheers, I'll stop being so damn lazy and addressing the problem to a forum, rather than addressing it myself

Madcat · Post by **Madcat** » Sun May 23, 2010 3:20 am

Check the option plate on the firewall for G80.

Jim

archangel62 · Post by **archangel62** » Sun May 23, 2010 6:12 pm

Yay!!! G80 is there

Sweeeeet

Now I just have to build the engine and put it in, to make sure the diff works. And if it needs shimming or new plates etc, get that done..

IZU069 · Post by **IZU069** » Sun May 23, 2010 6:53 pm

Mind you, G80 says what was originally fitted...
But I swapped that for my auto rear end.... (LOL)

Post by **wedgenut** » Sun May 23, 2010 8:32 pm

OH LMFAO, that's the way, build the poor guy up with the G80 bit, wait until he is wetting himself with excitement, then bring him down again like dropping a fridge on his head with the "MIND YOU" and the "BUT"

It is that streak of morbid sadism that sets you apart from other sentient beings. It must be fun on your planet. It cetainly entertains me...well done

archangel62 · Post by **archangel62** » Mon May 24, 2010 10:41 pm

LOL, that's why we love Pete. Cold hard logic. The way it should be.

Moment over, I'll check it properly when it stops bloody raining (in a week? We always get one solid week, then it's a desert again. One truckload of suck)

Might not be tight anyway. But this thing was pretty original til the bloke ripped the engine out a few weeks before I got it. Pity I didn't get to him first - I'd have found him a 4Z rather than stuff around re-fitting all the things I didn't pull apart. I can see myself staring a thousand threads and whingeing a lot..

IZU069 · Post by **IZU069** » Tue May 25, 2010 9:58 am

And that's what I like about you guys - clever enough to see the humor, but more so - smart enough to understand my comment or example. (Archy - not that I am thinking of any sites or individuals in particular...! LOL!)

Alas my comment is obvious to many even though it is often overlooked.
My example is somewhat bullsh - er, fictitious - but hopefully serves as a "real" example....

Of course, I could mention a time when I and another very talented but anon Isuzu-ite removed an LSD from a Pocket-A-Part Rodeo only to find (after removal!) that it was broken teeth that had locked the diff cage....
But I covered that above with:

IZU069 Tue May 18 wrote:Exceptions - welded or stuffed diffs (broken/seized spiders etc).

No need for expansion. People understand and get bored with my long replies.

PS - I have a few Jack&Rodeo LSDs. I have yet to confirm that Piazza crown's will bolt in (10 bolt), but I expect they will and therefore the pinion too.
(As with Belletts & Florians - Florians like Wasps can use a Piazza/Rodeo/Jackaroo diff centre; Belletts are on their own (only the GTR Bellett has LSD), but Florian/Bellett crown & pinions interchange... Florians are 4.1:1; Belletts are 3.9:1 or 3.7:1. Ooops - rambling again....

archangel62 · Post by **archangel62** » Sat Jun 19, 2010 10:27 pm

Well, sounds like Peter's wisdom wins yet again

Jacked one side today, handbrake off, and it turned with no more resistance than average brake drag. Feels awfully like an open diff.

Anyone got an LSD centre? How much?

Rodeobob · Post by **Rodeobob** » Sun Jun 20, 2010 12:13 am

I have a complete Piazza centre and also just a hemisphere that i salvaged from a diff the a bad case of toothless pinion.

Bob.

GEMWRC · Post by **GEMWRC** » Wed Jul 21, 2010 12:49 am

Curious as to if this is a LSD Piazza diff centre , check out that oil .. yuk!
I was told it was when i bought it.. by looking at im thinking not , but still hoping

GEMWRC · Post by **GEMWRC** » Wed Jul 21, 2010 12:59 am

i bought the diff off bradlze , its the torque tube style diff (import) , same diff in both pictures and the brakes are seized so cant turn much

Chris · Post by **Chris** » Wed Jul 21, 2010 1:02 am

cool pics though

IZU069 · Post by **IZU069** » Wed Jul 21, 2010 1:24 am

Hmmm - I missed the updates on this thread.

But to repeat earlier, I think the (Aussie) Piazza only has the LSD clutch plates on one side. (Others uses both sides - whether GT-R Belletts, Jackaroos, Rodeos, etc.)

And whilst manual Piazzas were LSD, (Aussie) auto Piazzas were not.

And I can't see any LSD plates in the earlier two pics. Looks open to me.... (But I may need to refill my drinking vessel for a better look....)